Question

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

x=2, x=−4


x=10, x=−8


x=−2, x=4


x=−10, x=8

Answer 1

x^2 + 2x − 8 = 0
x^2 + 2x = 8
Add 1 (half of 2 squared) to both sides: (x + 1)^2 = 9
x + 1 = ±3 → x = 2 or x = −4

Answer: x = 2, x = −4.