Answer: x = { -2, 2, 3}
Step-by-step 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
