Bonjour,
Développer les expressions:
D = (x + 7)²
D= (x + 7)(x + 7)
D= x²+7x+7x+49
D= x²+14x+49
E= (x - 4)²
E= (x - 4)(x - 4)
E= x²-4x-4x+16
E= x²-8x+16
F = (x - 2) (x + 2)
F= x²-2x+2x-4
F= x²-4
G=(2 x - 3)²
G= 4x²-6x-6x+9
G= 4x²-12x+9
H = (5 x + 1) (5 x - 1)
H= 25x²+5x-5x-1
H= 25x²-1