bonjour juste un petit exercice svp: resoudre l'équation f(x) = 3(x-4)(x+2) = -24

Bonjour,

3(x-4)(x+2) = -24

3(x² + 2x - 4x - 8) = -24

3(x² -2x - 8) = -24

x² - 2x - 8 = -8

x² - 2x - 8 + 8 = 0

x² - 2x = 0

x(x - 2) = 0

x = 0 ou x - 2 = 0

x = 0 ou x = 2

S = { 0 ; 2 }