Question

х^3 - 3х^2 - 4х + 12 = 0

Answer 1

х^3 - 3х^2 - 4х + 12 = 0

(x^3-3x^2)+(-4x+12)=0

x^2(x-3)-4(x-3)=0

(x^2-4)(x-3)=0

x^2=4 или x=3

x=±2

Ответ: -2; 2; 3.