3x squared-12 equals 0

Answer 1

3x2 - 12 = 0
Add 12 to both sides => 3x2 = 12
Divide both sides by 3 => x2 = 4
Take square roots of both sides => x = +/- 2

Or

3x2 - 12 = 0
3(x2 - 4) = 0
3(x + 2)(x - 2) = 0
x + 2 = 0 or x - 2 = 0
x = -2 or x = 2