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scZoUnD [109]
2 years ago
10

PLEASE HELP making brainliest if correct

Mathematics
1 answer:
nexus9112 [7]2 years ago
6 0

Answer:

im pretty sure its B

Step-by-step explanation:

im so sorry if im wrong tho

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I need some help please out
IceJOKER [234]

Question:

Solution:

Let the following equation:

\sqrt[]{12-x}=\text{ x}

this is equivalent to:

(\sqrt[]{12-x})^2=x^2

this is equivalent to:

12-x=x^2

this is equivalent to:

x^2+x-12=\text{ 0}

thus, we can conclude that

x= 3.

7 0
1 year ago
Hello I don’t understand question 9 a and b. Please show working out.<br> Thanks
brilliants [131]
A) I would make the positive integer x and then form an equation.

x + 30 = x^2 - 12
x + 42 = x^2
0 = x^2 - x - 42 this can be factorised
(x - 7) ( x + 6) Therefore x = 7 or x = -6

Since the question asks for a positive integer the answer is 7.

B) two positive numbers x and y.

X - y = 3
x^2 + y^2 = 117

Use these simultaneous equations to figure out each number.

Rearrange the first equation

x = y + 3

Then substitute it into the second equation.

(y+3)^2 + y^2 = 117
y^2 + 6y + 9 + y^2 = 117
2y^2 + 6y - 108 = 0
then factorise this.
(2y - 12) (y + 9)

This means that y = 6 or y = -9 but it’s 6 because that’s the only positive number.

Use y to find x

x = y + 3
x = 6 + 3
x = 9

So the answers are x = 9 and y = 6.
3 0
3 years ago
What is Ava's pay each month
jolli1 [7]
The answer to your question is $1978

6 0
3 years ago
Can a smart brainstormer help me
lukranit [14]
The answer is .1391
Hope this helps!
(If your confused, I just put this in a calculator)
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2 years ago
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Can some one answer this
Novosadov [1.4K]

Answer:

Step-by-step explanation

7 0
3 years ago
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