Solve for x.

Question

x2 + 4x − 12 = 0

A) x = −4 or x = 3
B) x = 4 or x = −3
C) x = −6 or x = 2
D) x = 6 or x = −2

Answer 1

x = [ -4 +/- sqrt (16 + 48) ] / 2
= [ -4 +/- 8 ] /2
= [ -4 + 8 ] /2 or [ -4 - 8 ] / 2

Answer 2

x^2+4x-12 = 0. -12 = -2*6. -2+6 = 4 = B.
(x-2)(x+6) = 0
x-2 = 0. X = 2.
x+6 = 0. X =

Answer 3

@henry x=-6