Question

Solve the equation by completing the square: x^2 + 2x - 8 = 0
A. x = 2 and x = -8
B. x = -4 and x = 2
C. x = 8
D. x = 1, x = 2 and x = -8

Answer 1

x^2+4x-2x-8=0
x(x+4)-2(x+4)=0

=>x-2=0 or x+4=0

x=2 or x=-4
answer is B