Solve x2 = 12x – 15 by completing the square. Which is the solution set of the equation? Solve x2 = 12x – 15 by completing the square. Which is the solution set of the equation?

Answers

Answer 1

Answer: [tex]6+\sqrt{21}\ \text{and}\ 6-\sqrt{21}[/tex]

Step-by-step explanation:

Given

Quadratic equation is

[tex]x^2-12x+15=0[/tex]

Solving by completing the square method

[tex]\Rightarrow x^2-2\cdot 6\cdot x+15=0\\\text{add and subtract 36}\\\Rightarrow x^2-2\cdot 6\cdot x+15+36-36=0\\\Rightarrow x^2-2\cdot 6\cdot x+36+(-36+15)=0\\\text{using}\ (a-b)^2=a^2+b^2-2ab\\\Rightarrow (x-6)^2-21=0\\\Rightarrow (x-6)^2=21\\\Rightarrow x-6=\pm \sqrt{21}\\\Rightarrow x=6\pm \sqrt{21}[/tex]

The solution set of the equation is [tex]6+\sqrt{21}\ \text{and}\ 6-\sqrt{21}[/tex]

Answer 2

Answer:

D on edge

Step-by-step explanation:


Related Questions

Need help with this. Find the value of each variable.

Answers

Answer:

Step-by-step explanation:

By applying sine rule in ΔACD,

cos(30°) = [tex]\frac{\text{Adjacent side}}{\text{Hypotenuse}}[/tex]

cos(30°) = [tex]\frac{CD}{AD}[/tex]

[tex]\frac{\sqrt{3} }{2}=\frac{z}{24}[/tex]

z = [tex]8\sqrt{3}[/tex]

By applying cosine rule in ΔACD,

sin(30°) = [tex]\frac{\text{Opposite side}}{\text{Hypotenuse}}[/tex]

sin(30°) = [tex]\frac{AC}{CD}[/tex]

[tex]\frac{1}{2}=\frac{AC}{24}[/tex]

AC = 12

By applying tangent rule in ΔACB,

tan(45°) = [tex]\frac{\text{Opposite side}}{\text{Adjacent side}}[/tex]

1 = [tex]\frac{AC}{BC}[/tex]

y = 12

By applying sine rule in ΔACB,

sin(45°) = [tex]\frac{BC}{AB}[/tex]

[tex]\frac{1}{\sqrt{2}}=\frac{y}{x}[/tex]

x = y(√2)

x = 12√2

Please help giving brainiest and 30 points

Answers

Answer:

94

Step-by-step explanation:

because it all adds up to 180 (i want brainliest)

I need help to know the volume

Answers

Answer:

167.55 ur welcom

Given: Circle O with diameter LN and inscribed angle LMN
Prove: Angle L M N is a right angle.

Circle O is shown. Line segment L N is a diameter. Points L, M, N, and K are on the circle. Lines connect each point.

What is the missing reason in step 5?


Statements

Reasons
1. circle O has diameter LN and inscribed angle LMN 1. given
2. Arc L K N is a semicircle 2. diameter Circle divides into 2 semicircles
3. circle O measures 360o 3.
measure of a circle is 360o

4. m Arc L K N = 180o 4. definition of semicircle
5. m∠LMN = 90o 5. ?
6. ∠LMN is a right angle 6. definition of right angle
HL theorem
inscribed angle theorem
diagonals of a rhombus are perpendicular.
formed by a tangent and a chord is half the measure of the intercepted arc.

Answers

Answer:

B : inscribed angle theorem

Step-by-step explanation:

The missing reason in step 5 is; Inscribed angle theorem.

Inscribed angle theorem

Within the context of circle geometry, an inscribed angle is the angle formed in the interior of a circle as a result of the intersection of two chords on the circumference of the circle.

Put differently, an inscribed angle is defined by two chords of the circle sharing an endpoint.

Ultimately, since the chords LM and MN intersect on the circumference, with LM being the diameter of the circle, then the measure of angle LMN is 90°.

Read more on inscribed angle theorem;

https://brainly.com/question/5436956

Determine which ordered pair is part of the solution set for the inequality.
3x + y ≥ 6
(4, 3), (-2, 4), (-5, -3), (3, -3)

Answers

the answer is :(4.3) and (3.-3)

Explanation:You just replace the values but first you start by sending the 3x to the other side

which of the following segments is Tangent to the circle ​

Answers

Segment DE because it touches the circle at one point only

PLEASE HELP SOON!!!!!!!!

Answers

Answer:

8xh>168, and h>21.

Step-by-step explanation:

I took this quiz.

Answer:

8 x h = 168 and h > 21

Step-by-step explanation:

I hope this helps.

I am sorry if I got it wrong.

Find the area of the parallelogram.
3 cm
3.2 cm
10 cm

Answers

Answer:

area

Step-by-step explanation:

area of parallelogram = base × height

= 10× 3

= 30 cm²

plz mark my answer as brainlist plzzzz vote .

hope this will be helpful to you .

The area of the parallelogram is [tex]30cm^2[/tex].

Given that,

The base of the parallelogram is 10 cm.And, the height of the parallelogram is 3 cm.

Now the area of the parallelogram is

[tex]= base \times height\\\\= 3 \times 10\\\\= 3cm^2[/tex]

Therefore we can conclude that the area of the parallelogram is [tex]30cm^2[/tex]

Learn more about the parallelogram here: brainly.com/question/9680084

Write the equation of the graph.

Answers

I believe the equation is f(x) = 2^x -3

Write an equation in point-slope form and slope-intercept form
for each line.
1. passes through (2,5), slope = -1
Please help

Answers

Answer:

epresented on the horizontal axis and elevation on the vertical axis. For each situation, decide if the ... (from Unit 3, Lesson 4). 4. Each square on a grid represents 1 unit on each side. Match the numbers with the slopes of the lines. 1. - 7 / 1. C.

Step-by-step explanation:

how many lines of symmetry does the figure have

Answers

Step-by-step explanation:

we can see that it is a hexagon and the lines of symmetry in hexagon are 6

we can too see that the figure is having all sides equal...

hope it helps

Answer:

I think that the answer might be 6

Comparing lengths of sharks horn shark is 2 3/4 feet long a blue shark is 4 times longer what is the answer

Answers

Answer:

11

Step-by-step explanation:

Change 2 3/4 to a mixed number.

11/4

Then multiply

11/4 • 4

Get rid of common denominators. Which are the 4s.

So you're left with 11.

Or you could just turn 4 into 4/1.

Which would be 44/4.

Which simplifies to 11.

Hope this helps.

What factor is represented by the yellow shading in the model? [Hint: Include the overlapping area.]

Answers

Answer:

[tex]Fracton = \frac{1}{6}[/tex]

Step-by-step explanation:

Given

See attachment

Required

The fraction of yellow

From the attached image:

[tex]Yellow = 5[/tex]

[tex]Total = 30[/tex]

So, the fraction is:

[tex]Fracton = \frac{Yellow}{Total}[/tex]

[tex]Fracton = \frac{5}{30}[/tex]

Divide by 5/5

[tex]Fracton = \frac{1}{6}[/tex]

Answer: 4/5

Step-by-step explanation:

Marissa can run 1 mile in 10 minutes.
How many miles can she run in a half
hour?
(If there is extra information, identify it. If
there is not enough information, tell what information is needed.

Answers

Answer:

3 miles

Step-by-step explanation:

if she can run at a constant speed for 30 minutes, then it is 3 miles. But, if there is some reason that she cannot run at the same rate as she did for one mile, the answer is unknown.

3 miles
Because if you notice that half an hour is 30 minutes then you multiply 1 mile and 10 minutes by 3 and you’ll get 3 miles in 30 minutes.
1mile/10minutes x 3 = 3 miles in 30 minutes

4,400,000 in scientific notation.

Answers

Answer:

4.4 * [tex]10^{6}[/tex]

Step-by-step explanation:

Answer:

4.4 x 10^6

Step-by-step explanation:

The decimal in scientific notation needs to be less than 10, so in this case the decimal has to be 4.4.

After you place the decimal you should have, 4.400000.

Count how much decimal spaces you have to jump in order to get to the end of the number overall, in this case, it is 6 to the 10th power.

So the answer would be, 4.4 x 10^6  

Im not sure how to do this or what function to use SIN, COS, or TAN but if you could walk me through it that would be so so so amazing!!! Thanks so much have an amazing day!!!

Answers

Answer: 3.8

Step-by-step explanation:first, you need to figure out what side you’re looking for. Side AC is opposite of the angle you’re given. They also give you length of side AB which is 4. That is the hypotenuse (side directly across from right angle). So, you have the hypotenuse, and need the find the opposite side measure. Which option uses opposite and hypotenuse? That’s Sin. So, you would do: sin70 = ? / 4.

sin (of given angle)= opposite / hypotenuse.

Sin (70 degrees) = ? / 4

Then you solve for “?”

Type sin70 into your calculator, then multiply both sides by 4 to get “?” by itself. You should get 3.758770483, which rounds to 3.8

Find the area of ACD

Answers

Answer:

dude

Step-by-step explanation:

use a ruler

What is the sum of 1/2 + 1/4?

Answers

Answer:

3/4

Step-by-step explanation:

have a great day :D

what is 3m < -12 if someone can please answer me

Answers

Answer:

Step-by-step explanation:

3m < - 12

m < - 12/3

m < - 4

Answer: -4

Step-by-step explanation:

3m < -12

3m/3 < -12/3

m = -4

As
Point A is at (-5. - 4) and point B is at (5.-3).
MY
What is the midpoint of line segment AB?

Answers

It is 25 hzjzsjwj rjsisiwn ejwjwjwjwjw
Es

Find the surface area of each figure. Round your answers to the nearest hundredth, if necessary

Answers

Answer

238π yd^2

Step-by-step explanation:

here's your solution

=> height of cylinder = 10 yd

=> radius of cylinder = 7 yd

=> formula to calculate surface area = 2πr(h + r)

=> putting the value of height and radius in formula

=> SA = 2*22/7*7(10+7)

=>. SA = 2*22*17

=> SA = 748 yd.sq

hope it helps

Solve the system by substitution.
y = 7x – 20
y = 2x

Answers

Answer:

x=4 y=8

Step-by-step explanation:

Solve for the first variable in one of the equations, then substitute the result into the other equation

what is the difference between 2/4 and 4/9

Answers

The different between 2/4 and 4/9 is 2/36. i got my answer by changing the two fractions so that they have common denominators. i did this by checking if they have common multiples and they did. the common multiple is 36. so first, i turned 2/4 into 18/36 by multiplying 2 by 9 and multiplying 4 by 9. then, i did the same for 4/9. hope this helped!

Answer:

Step-by-step explanation:

Here's how to subtract 4/9 from 2/4:

[tex]\frac{2}{4} -\frac{4}{9}[/tex]

Step 1:

We can't subtract two fractions with different denominators. So you need to get a common denominator. To do this, you'll multiply the denominators times each other... but the numerators have to change, too. They get multiplied by the other term's denominator.

So we multiply 2 by 9, and get 18.

Then we multiply 4 by 4, and get 16.

Next we give both terms new denominators -- 4 × 9 = 36.

So now our fractions look like this:

[tex]\frac{18}{36} -\frac{16}{36}[/tex]

Step 2

Since our denominators match, we can subtract the numerators.

18 − 16 = 2

So the answer is:

[tex]\frac{2}{36}[/tex]

Step 3

Last of all, we need to simplify the fraction, if possible. Can it be reduced to a simpler fraction?

To find out, we try dividing it by 2...

Are both the numerator and the denominator evenly divisible by 2? Yes! So we reduce it:

[tex]\frac{2}{36}[/tex]÷2=[tex]\frac{1}{8}[/tex]

Let's try dividing by 2 again...

No good. 2 is larger than 1. So we're done reducing.

There you have it! The final answer is:

[tex]\frac{1}{8}[/tex]

I hope this helps      :)

help i dont know what to do

Answers

Hey so the answer is D because when you subtract you would get the other side of the problem

Wayne types about 50 words per minute.A typical double spaced page contains 500 words.how long doe sit take Wayne to type 8 1/2 pages?

Answers

Answer:

Step-by-step explanation:

50t=500(8.5)

t=10(8.5)

t=85 minutes

Answer: 85 minutes

Step-by-step explanation:

First, find how many minutes it takes for Wayne to type a page containing 500 words. 500/50= 10 minutes

You then multiply that by 8

8(10)= 80 minutes to type 8 pages.

Now find how many words are in half a page.

500/2=250 words

Divide that by the amount of words Wayne can type per minute. 250/50= 5

Add that to the amount of minutes it took to type 8 pages. 85 minutes

Which is also 1 hour 25 minutes

3/5 feet long by 2/3 feet wide
What is the area?​

Answers

Answer:

2/5

Step-by-step explanation:

To find Area you have times do length times Width so you would be doing 3/5 times 2/3 which would give you 2/5.

Jalen charges customers a flat fee of $30 to mow their grass plus $8.50 an hour for additional yard work. If Mr. Williams pays Jalen $51.25, how long was spent on additional yard work?

Answers

Answer:

She spent 2 and a half hours doing extra work.

(-1/5) + 4/5 = x
^those are fractions btw. Plz answer.

Answers

Answer:

x= 3/5

Step-by-step explanation:

i hope this helps :)

Calculate the following using long division show all working 896 divided by 7

Answers

Answer:

128

Step-by-step explanation:

896

7 goes into 8 once

Subtract 7 from 8 and bring the one down.

8 goes into 19 twice

Subtract 14 from 19 and bring the five down.

7 goes into 56 eight times.

So your answer is 128.

Hope this helps

if : (a,2a) satisfies the relation : y = x-1 then a=
1
-1
10
3

Answers

What grade are you in ?

Answer:

a=-1

Step-by-step explanation:

∵ (a,2a) satisfies y=x-1

so 2a=a-1

2a-a=-1

a=-1

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