Question

PLEASE HELP

Answer 1

Answer:

A

Step-by-step explanation:

Completing the square requires a quadratic in $ax^2+bx=c$ form. Once in this form, calculate $(\frac{b}{2})^2$.

Here x2 - 2x - 8 = 0 converts to x2 - 2x = 8. So b = -2.

$(\frac{b}{2})^2=(\frac{-2}{2})^2=1$

Add 1 to both sides.

x2 - 2x + 1 = 8 + 1

(x -1)^2 = 9

Square root both sides.

x-1 = 3                        x - 1 = -3

x = 4                           x = -2

This is the solution.