Complete the square x^2+4x+8

Answers

Answer 1

\(x^2 +4x +8\\\\= x^2 + 2 \cdot 2 \cdot x + 2^2 - 2^2 +8\\\\=(x+2)^2 - 4 +8 \\\\= (x+2)^2 +4\)

Answer 2

Answer:

2(x+2)

Step-by-step explanation:

STEPS USING DIRECT FACTORING METHOD

x  

2

+4x+8

Quadratic equations such as this one can be solved by a new direct factoring method that does not require guess work. To use the direct factoring method, the equation must be in the form x  

2

+Bx+C=0.

x  

2

+4x+8=0

Let r and s be the factors for the quadratic equation such that x  

2

+Bx+C=(x−r)(x−s) where sum of factors (r+s)=−B and the product of factors rs=C

r+s=−4

rs=8

Two numbers r and s sum up to −4 exactly when the average of the two numbers is  

2

1

∗−4=−2. You can also see that the midpoint of r and s corresponds to the axis of symmetry of the parabola represented by the quadratic equation y=x  

2

+Bx+C. The values of r and s are equidistant from the center by an unknown quantity u. Express r and s with respect to variable u.

r=−2−u

s=−2+u

To solve for unknown quantity u, substitute these in the product equation rs=8

(−2−u)(−2+u)=8

Simplify by expanding (a−b)(a+b)=a  

2

–b  

2

 

4−u  

2

=8

Simplify the expression by subtracting 4 on both sides

−u  

2

=8−4=4

Simplify the expression by multiplying −1 on both sides and take the square root to obtain the value of unknown variable u

u  

2

=−4

u=±  

−4

=±2i

The factors r and s are the solutions to the quadratic equation. Substitute the value of u to compute the r and s.

r=−2−2i

s=−2+2i


Related Questions

there is a cuboid with a length of 4m by 2.5m by 2.5m find the length of the wire used to make the cuboid

Answers

The length of the wire used to make the cuboid is 36 meters.

To find the length of the wire used to make the cuboid, we need to calculate the perimeter of all the edges of the cuboid.

The cuboid has dimensions:

Length = 4m

Width = 2.5m

Height = 2.5m

Let's calculate the perimeter of each face of the cuboid and then sum them up to find the total length of the wire.

Face 1: Length x Width

Perimeter of face 1 = 2(Length + Width) = 2(4m + 2.5m) = 2(6.5m) = 13m

Face 2: Length x Height

Perimeter of face 2 = 2(Length + Height) = 2(4m + 2.5m) = 2(6.5m) = 13m

Face 3: Width x Height

Perimeter of face 3 = 2(Width + Height) = 2(2.5m + 2.5m) = 2(5m) = 10m

Now, let's sum up the perimeters of all three faces to find the total length of the wire:

Total wire length = Perimeter of face 1 + Perimeter of face 2 + Perimeter of face 3

                 = 13m + 13m + 10m

                 = 36m

Therefore, the length of the wire used to make the cuboid is 36 meters.

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In a network of 30 computers, 4 have a copy of a particularly critical file to sustain an organization's regular operations. Suppose that 9 computers at random fail. What is the probability that all 4 computers with the critical file fail in this incident? (

Answers

The probability that all 4 computers with the critical file fail in this incident

P(x=4)=0.00085

This is further explained below.

What is the probability that all 4 computers with the critical file fail in this incident?

Generally,  is  mathematically given as

\($H \rightarrow(n, m)$\)

p.d.F. of Hyper Geometric distribution

given, $N=39, n=4, M=8, x=4$

\(\begin{aligned}P(x=4) &=\frac{8}{4} \frac{39}{39} \\&=\frac{70 \times 1}{82251}\end{aligned}$$\)

\(\begin{aligned}&P(x=4)=8.5106 \times 10^{-4} \\&P(x=4)=0.00085\end{aligned}\)

In conclusion, P(x=4)=0.00085

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A farmer finds that if she plants 75 trees per acre, each tree will yield 50 bushels of fruit. She estimates that for each additional tree planted per acre, the yield of each tree will decrease by 2 bushels. How many trees should she plant per acre to maximize her harvest?

Answers

The number of trees that this farmer should plant per acre to maximize her harvest is 50 trees.

How to determine the number of trees?

In order to solve this word problem, we would assign a variable to the number of trees per acre, and then translate the word problem into algebraic equation as follows:

Let the variable x represent the number of trees per acre.

Mathematically, the total yield for an acre can be calculated by using this mathematical expression:

Total yield for an acre (T) = yield of each tree × number of trees per acre

Substituting the given parameters into the mathematical expression, we have the following;

Total yield for an acre (T) = (50 - 2x) × (75 + x)

Total yield for an acre (T) = 3,750 + 50x - 150x - 2x²

Total yield for an acre (T) = 3,750 - 100x - 2x²

Next, we would differentiate with respect to x and equate to zero to find the maximum harvest:

dT/dx = d/dx(3,750 - 100x - 2x²)

dT/dx = -100 - 4x

0 = -100 - 4x

4x = -100

x = -100/4

x = -25

Therefore, the required number of trees for maximum harvest:

Number of trees = 75 + x

Number of trees = 75 - 25

Number of trees = 50 trees.

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Can someone please help, ty!!
(Will mark brainliest)

Can someone please help, ty!!(Will mark brainliest)

Answers

Answer:

Arcadia

Step-by-step explanation:

the line in the box is the median and Arcadia is bigger than Millersburg



8.2: Word Problems - UNDERLINE key words, set up your division sentence, then solve!
Ms. K's cooking club needs 2 1/4 cups of flour to make enough crepes for everyone in the class. The
club split into 6 smaller groups, each making their own batch. How much flour does each group
need?

Answers

Answer:

3/8

Step-by-step explanation:

hope it helps :)

1. Find the 15th term in the sequence if a1= 3 and d= 4

2. Find Sn for the arithmetic series where a1= 5, an= 119, n= 20


3. Find Sn for the arithmetic series where a1= 12, d= 6, n= 15


4. Find the 6th term in the geometric sequence where a1= 2, a6= 64, r= 2


5. Find Sn for the geometric series where a1= 2 , r= 4, n= 6

Answers

The 15th term in an arithmetic sequence with first term is 59.The sum of an arithmetic series with first term  is 620.The sum of an arithmetic series with first term is 810.The nth term in a geometric sequence with first term is 64.The sum of a finite geometric series with first term is 2730.Solving for the sequence we have:To find the 15th term in an arithmetic sequence with first term a1 and common difference d, we use the formula: an = a1 + (n - 1)d. Plugging in the values, we get:

an = 3 + (15 - 1) * 4 = 3 + 14 * 4

= 3 + 56

= 59

So, the 15th term in the sequence is 59.

2. To find the sum of an arithmetic series with first term a1, last term an, and number of terms n, we use the formula: Sn = n/2 * (a1 + an). Plugging in the values, we get:

Sn = 20/2 * (5 + 119)

= 20/2 * 124

= 620

So, the sum of the series is 620.

3. To find the sum of an arithmetic series with first term a1, common difference d, and number of terms n, we use the formula: Sn = n/2 * (2a1 + (n - 1)d). Plugging in the values, we get:

Sn = 15/2 * (2 * 12 + (15 - 1) * 6) = 15/2 * (24 + 84)

= 15/2 * 108

= 810

So, the sum of the series is 810.

4.To find the nth term in a geometric sequence with first term a1, common ratio r, and nth term an, we use the formula: an = a1 * r⁽ⁿ⁻¹⁾. Plugging in the values, we get:

64 = 2 * r⁽⁶⁻¹⁾

64 = 2 * r⁵

32 = r⁵

r = \(2^{(5^{(1/5)} )}\)

So, the 6th term in the sequence is 64.

5. To find the sum of a finite geometric series with first term a1, common ratio r, and number of terms n, we use the formula: Sn = a1 * (1 - rⁿ) / (1 - r). Plugging in the values, we get:

Sn = 2 * (1 - 4⁶) / (1 - 4)

= 2 * (1 - 4096) / -3

= 2 * (-4095) / -3

= 2730

So, the sum of the series is 2730.

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Jupiter takes 4332 earth days to orbit the sun mercury orbits the sun in 88 earth days. How many complete orbits will mercury make until Jupiter completes one

Answers

Answer:

At this distance, Jupiter takes 11.8618 Earth years to complete a single orbit of the Sun. In other words, a single Jovian year lasts the equivalent of 4,332.59 Earth days.

Step-by-step explanation:

that the best i can do !!!!

write the equation in standard form: 4x - 3 = 5y

Answers

Answer:

4x−5y=3

Step-by-step explanation:

Answer:

Step-by-step explanation:

write the equation in standard form: 4x - 3 = 5y

what is the nth term in a cube number sequence

Answers

Answer:

cube numbers: 1, 8, 27, 64, 125, ... - the nth term is. triangular numbers: 1, 3, 6, 10, 15, ... (these numbers can be represented as a triangle of dots).

Step-by-step explanation:

IF IT HELPED UH PLEASE MARK ME A BRAINLIEST :-)

HELP ME!!!!! Select all of the symbols that would make the comparison true.


−|−9| ___ −9





<





>

=

Answers

Answer:

=

Step-by-step explanation:

Drag and drop a symbol to correctly compare the expressions.

Drag and drop a symbol to correctly compare the expressions.

Answers

From the information provided in the picture we have two numbers, -5 and 5. Both numbers are written in the absolute value sign.

That is;

\(\begin{gathered} |-5|\text{ and } \\ |5| \end{gathered}\)

The absolute value sign makes the number assume a positive value. Therefore, both are positive at this point. We now have;

\(|-5|=|5|\)

ANSWER:

The "equal to" sign goes into the answer box.

lect the correct answer.
Under which condition is the sample proportion, , a point estimate of the population proportion?

A.
The sample proportion is never a point estimate of the population proportion.
B.
The sample represents a proportion of the population.
C.
The sample proportion is unbiased.
D.
The sample size, n, is small enough.
Reset Next

Answers

The correct answer is B. The sample represents a proportion of the population.

What is the sample population ?

A point estimate is a single value used to estimate a population's unknown parameter. The sample proportion (denoted by p), in the context of determining the population proportion, is a widely used point estimate. The sample proportion is determined by dividing the sample's success rate by the sample size.

The sample must be representative of the population for it to be a reliable point estimate of the population proportion. To accurately reflect the proportions of various groups or categories present in the population, the sample should be chosen at random.

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Eric can choose Plan A or Plan B for his long distance charges. For each plan, cost (in dollars) depends on minutes used (per month) as shown below.

Eric can choose Plan A or Plan B for his long distance charges. For each plan, cost (in dollars) depends

Answers

(a) Plan B, 8

At 150 minutes, Plan B costs $20 and Plan A costs $12.

(b) 250, Plan A

The costs are the same when the graphs intersect.Before 250 minutes, the graph for Plan A is lower than the graph of Plan B, meaning the graph of Plan A will cost less.

The table below shows that 1 day equals 24 hours. Notice that 12 hours is one-half of that. Use the table to help you determine how many days are equal to 30 hours. 1 day 24 hours 12 hours 12 hours 1 and 1 over 4. days 1 and 1 over 2. days 1 and 3 over 4. days 2 days

Answers

Answer:

12 hours +  12 hours and 1 over 4

or 12 + 13 + 1/4 / 6 hours

Step-by-step explanation:

this is true since 1/4 of a day is 6 hours and  30 hours is equivalent to 24 hours plus 6 extra hours..

Answer:

HOURS AND HOURS WHIC IS EQUAL TO 24 WHICH MEANS 1 X 4 IS 4 SO THE ANSWER IS 42

Step-by-step explanation:

make e the subject
e-5=2f

Answers

Answer:

e-5=2f

take '-5' to the other side where '2f' is

e=2f+5

Which point is represented by 6 times the quantity cosine 11 pi over 6 plus i times sine 11 pi over 6 end quantity question mark

Which point is represented by 6 times the quantity cosine 11 pi over 6 plus i times sine 11 pi over 6

Answers

\(6\left[\cos\left( \frac{11\pi }{6} \right) +i\sin\left( \frac{11\pi }{6} \right) \right] \\\\\\ 6\left[\cfrac{\sqrt{3}}{2}~~,~-\cfrac{1}{2}i \right]\implies (3\sqrt{3}~~,~-3i) ~~ \approx ~~ \stackrel{ \textit{\LARGE S} }{(5.2~~,~-3i)}\)

What is the difference in marcel and Stephanie tax burdens ?

Answers

Answer:

Marcel's and Stephanie's taxable incomes are less than their annual salaries because they both have a series of tax deductions

Step-by-step explanation:

I need this quick pls.​

I need this quick pls.

Answers

Answer:

8/3

Step-by-step explanation:

Slope is rise/run. The rise here is 8. The run is 3. The line rises left to right so the slope is positive.

Hope it helps!

A jar of dimes and quarters contains $2.55. There are 15 coins in all. How many of each coin are there? (Show Steps)

Answers

In linear equation, $38.25 are each coin are there .

What in mathematics is a linear equation?

An algebraic equation with simply a constant and a first-order (linear) term, such as y=mx+b, where m is the slope and b is the y-intercept, is known as a linear equation.

                                 Sometimes, the aforementioned is referred to as a "linear equation of two variables," where x and y are the variables.

 A jar of dimes and quarters  = $2.55

 There are 15 coins in all.

  total coins = $2.55 * 15

                    = $38.25

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For safety reasons, the angle a ladder makes with the ground should be no greater than 67°. Find the length to the nearest foot of the shortest ladder that will safely reach a roof that is 23 feet high.

Answers

Using trigonometric function the length to the nearest foot of the shortest ladder that will safely reach a roof that is 23 feet high is calculated as 25 feet.

What are trigonometric functions?

Simply put, trigonometric functions—also called circular functions—are the functions of a triangle's angle. This means that these trigonometric functions provide the relationship between the angles and sides of a triangle. Sine, cosine, tangent, cotangent, secant, and cosecant are the fundamental trigonometric functions.

Given the angle a ladder makes with the ground should be no greater than 67°.

So the angle θ ≤ 67°.

Let us assume the angle to be equal to 67°

The height of the roof from the ground is 23 feet.

The ladder and wall form the right triangle where the ladder works as hypotenuse and the wall as perpendicular.

With the sine function, find the length of the ladder -

sin θ = perpendicular/hypotenuse

Let the length of ladder be x.

sin 67° = 23/x

x = 23/sin 67°

x = 23/0.920

x = 25 feet

Therefore, the length of the ladder is 25 feet.

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Pedrobuysawheelbarrowpricedat$86.Shippingandhandlingareanadditional30%oftheprice.HowmuchshippingandhandlingwillPedropay?

Answers

The price of the wheelbarrow is $86, and Pedro will need to pay an additional 30% of the price for shipping and handling.

To calculate the shipping and handling cost, we can first find 30% of the price of the wheelbarrow:

30% of $86 = 0.3 x $86 = $25.80

Therefore, Pedro will need to pay $25.80 for shipping and handling.

Aubrey is going to see a movie and is taking her 2 kids. Each movie ticket costs $13 and there are an assortment of snacks available to purchase for $4 each. How much total money would Aubrey have to pay for her family if she were to buy 3 snacks for everybody to share? How much would Aubrey have to pay if she bought x snacks for everybody to share?

Answers

Answer:

$51

Step-by-step explanation:

do 13*3 because of the 2 kids and the adult then add 12 because of the snacks

hope this helps

Answer:

51 and what?

Step-by-step explanation:

3 x 13 = 39                  4 x 3 = 12

39 + 12 = 51

what is x supposed to be, sorry, i suck at variables

What is the value of 43 = 23? 2 7 8 16​

Answers

Answer:

16

Step-by-step explanation:

I dont really inderstand but i would say 16 because it is closer to adding up to 43 so yea

Determine whether the ratios 5:7 and 10:21 are equivalent

Answers

Answer:

Step-by-step explanation:

No, thoose two ratios are not equivalent, but I can show you the ones that are  equivalent, {You can write 5/7 or 10/14 or 20/28 or 40/56. There! 3 equivalent ratios.}

What is the solution to the following system of equations? (1 point) x − 3y = 6 2x + 2y = 4

Answers

Answer:

x = 3

y = -1

Step-by-step explanation:

Solving system of equations:

             Method:  substitution

x - 3y = 6 --------------(I)

      x  = 6 + 3y -------------(II)

2x + 2y = 4 ----------(III)

Substitute x = 6 +3y in equation (II),

        2*(6+3y) + 2y = 4

Use distributive property to open the parenthesis,

     2*6 + 2*3y + 2y = 4

         12 + 6y + 2y = 4

Combine like terms.

            12 + 8y      = 4

Subtract 12 from both sides,

                        8y  = 4 - 12

                        8y = -8

Divide both sides by 8,

                          y = -8÷ 8

                            \(\boxed{\bf y = (-1)}\\\)

Substitute y = -1 in equation (II) and find the value of x.

               x = 6 + 3*(-1)

                  = 6 - 3

               \(\sf \boxed{\bf x = 3}\)

Answer:

(3, - 1 )

Step-by-step explanation:

x - 3y = 6 ( add 3y to both sides )

x = 3y + 6 → (1)

2x + 2y = 4 → (2)

substitute x = 3y + 6 into (2)

2(3y + 6) + 2y = 4

6y + 12 + 2y = 4

8y + 12 = 4 ( subtract 12 from both sides )

8y = - 8 ( divide both sides by 8 )

y = - 1

substitute y = - 1 into (1)

x = 3(- 1) + 6 = - 3 + 6 = 3

solution is (3, - 1 )

If 35% of a number is 21 and 90% of the same number is 54, find 55% of that number.


How do you do this on Delta Math?It is for 7th grade math.

Answers

Answer:

Step-by-step explanation:

The number is 60:

Divide the amount and decimal of the percentage to be extracted

Case 1

\(\frac{21}{0.35} =60\)

Case 2

\(\frac{54}{0.9} =60\)

Now the 55% of this number is:

\(60(0.55)=33\)

Hope this helps

Need help please !!
Geometry

Need help please !!Geometry

Answers

Answer:

complementary since the angles sum up to 90

explain 3 factors that should be considered in the construction of index numbers

Answers

Purpose of the Index Number:Selection of Formula:Selection of Prices:

1. selection of index number: during the construction of index number it is to be kept in mind that the selection of the index number should be correct accordingly.

2. selection of formula: while the construction of index numbers it is compulsory to select the correct formula for the given question.

3. selection of price: selection of prices should be done accordingly while constructing the index numbers.`

construction of index number is also available in two parts:

1. simple

2. weighted

1. simple: the simple method is classified into simple aggregative and simple relative.

2. weighted: the weighted method is classified into a weighted aggregative and weighted average.

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You are examining the data with a stem-and-leaf plot. Here is the start of the plot. Finish the plot.

You are examining the data with a stem-and-leaf plot. Here is the start of the plot. Finish the plot.

Answers

The stem-and-leaf plot is finished as follows:

4| 1 3 7.

What is a stem-and-leaf plot?

The stem-and-leaf plot lists all the measures in a data-set, with the first number as the key, for example:

4|5 = 45.

To complete the stem-and-leaf plot, we must obtain the measures above 40 from the table, which are given as follows:

41, 43 and 47.

Considering the format of the plot, the plot is completed as follows:

4| 1 3 7.

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justin walk 5 kilometer and he turn right and he swim 35 meters why the apple is red?​

Answers

Answer:

Red apples get their color from anthocyanins. These are pigments, or natural colorings, that develop as the apple grows. It absorbs all the colors of the rainbow—except for red. The red light reflects off the apple and our brain and eyes work together to let us know what color we are seeing

Step-by-step explanation:

The first part of the question does not correlate to the final question the problem is asking. Therefore, we just need to find out why apples are red. A simple google search can tell you why ^^

Answer:

it's nature first it's green after its gets ready to eat it's colour change

in am just joking

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Suppose you mix an unknown clear liquid with water and the added liquid mixes completely with the water so that no layers are visible. what is most likely true about the unknown liquid? Help please!! I will give brainliest!!Cellular (aerobic) respiration takes place in the presence of and with the use of a certain element.Which element is it? effective e-mail messages and memos usually discuss only one topic. T/F? Discuss the question ""COVID 19 expected to bring up unemployment: what does that mean for Canada?"" in light of the data you have just produced. Highlight the differences in scenario between provinces and genders (if there is any). Jinay's cost of goods sold in the year of sale (2019) was $860,000 and 2018 cost of goods sold was $880,000. The inventory at the end of 2019 was $199,000 and at the end of 2018 the inventory was $219,000. Jinays average number of days to sell its inventory during 2019 is closest to: (Use 365 days a year. Do not round intermediate calculations.)Multiple Choice88.70 days86.69 days84.46 days90.84 days Which model supports the idea that, as matter flows between systems,elements are recombined in different ways? when you have had little or no time to prepare your speech, but get up and speak about what you think you had prepared, you are using extemporaneous delivery. t/f Can somebody plz help answer both questions correctly thank you!!WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST :D if dustin travels 2.42 km clockwise along the ski trail, what is the angle's measure in radians? Which of the following statements best describes the religious beliefs of the Maya? A. The Maya believed that one powerful god created and controlled the world. B. The Maya did not practice a religion. C. The Maya believed gods existed, but did not pay attention to them in daily life. D. The Maya thought that many gods controlled all aspects of their lives. Joe drinks 10 liters of water every week. There are approximately 19 liters in 5 gallons. How many gallons of water would Joe drink in 3 weeks? (round to nearest whole number for answer, there are 2 steps to this problem first set up proportion) During interphase of the cell cycle, ________. Question 6 options: DNA recombines the nuclear membrane disappears DNA content essentially doubles sister chromatids move to opposite poles H3X is a triprotic acid for which Ka1 = 7.5 10-4, Ka2 = 1.7 10-5 and Ka3 = 4.0 10-7. What is the value of Kb for HX2-? Identify each practice as promoting either the goal of openness or the goal of transparency. e cos(e)d Hint: Rewrite e =e e. healthy citizens are the greatest assets of country what can a state do to keep her citizens healthy where hydrogen is located in the formula FILL IN THE BLANK. in general, the ionization energy of a singly-charged anion___as the electron affinity of the neutral atom___. Which of the following figures has 90 rotation symmetry?a oval b trianglec circle d rectangle Is zinc a metal, non metal or metalloid