Question

Complete the square to solve the following quadratic equation: x2+2x−8=0
.(1 point)

x=−2
, x=4


x=10
, x=−8


x=−10
, x=8


x=2
, x=−4

Answer 1

x^2 + 2x − 8 = 0
(x+1)^2 − 1 − 8 = 0 → (x+1)^2 − 9 = 0
(x+1)^2 = 9 → x+1 = ±3 → x = 2 or x = −4.