Question

X^3 -3x^2 -4x + 12 = 0

Answer 1

3x-6x-4x+12=0
-7x+12=0
-7x=-12
X=12/7

Answer 2

Answer: x = { -2, 2, 3}

Explanation:

Using cluster factorization, we write:

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

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

x^2 - 4 = 0 (I) or x - 3 = 0 (II)

(I) x^2 = 4

x = -2 ou x = 2

(II) x = 3

Therefore, the solution is:

x = -2; x = 2 ; x = 3