Bonsoir
E = (3x+2)² -(5-2x) ( 3x+2)
Développement
E = 9x² +12x +4 - 15x -10 -6x² -4
E = 3x² -3x -10
Factorisation
E = (3x+2)(3x+2)- (5-2x)
E = (3x+2)(3x+2-5+2x)
e = (3x+2)(5x -3)
Pour x = -2
E = (-6+2)(-10-3) = -4 x -13 = 52
(3x+2)(5x-3) = 0
soit 3x+2 = 0 donc 3x = -2 et x = -2/3 = - 1.5
soit 5x-3 = 0 donc 5x = 3 et x = 3/5 = 0.6
