Question

Follow the process of completing the square to solve x2 = -4x + 3.

Which of the following equations is used in this process?

A)(2x + 4)2 = 12
B)(2x + 4)2 = 19
C)(2x + 4)2 = 28

Answer 1

it would be a because 2x one x means times one and 4x3 equals 12 so it would be A

Answer 2

C

Explanation:

The steps to solving the equation would be the simple. The previous step would:

`(2\cdot{x}+4)^2=28`

If we multiply the brackets:

`4\cdot{x^2}+16\cdot{x}+16=28`

`4\cdot{x^2}+16\cdot{x}=28-16`

`4\cdot{x^2}+16\cdot{x}=12`

`4\cdot{x^2}=-16\cdot{x}+12`

We dividing the whole equation by 4:

`x^2=-4\cdot{x}+3`

The answer is C