Resposta :
Oi :)
(x² + 4x - 12) = (x - 2)(x + 6) = 0
(x - 2) = 0 ou (x + 6) = 0
x = 2, -6
(x² + 4x - 12) = (x - 2)(x + 6) = 0
(x - 2) = 0 ou (x + 6) = 0
x = 2, -6