Bonsoir
Développer les expressions suivantes :
i = (2x +7)(2x - 7)
I = (2x)^2 - 7^2
I = 4x^2 - 49
T=x(7x + 5)
T = x * 7x + x * 5
T = 7x^2 + 5x
B=(8x - 11) (4x - 5)
B = 8x * 4x - 8x * 5 - 11 * 4x - 11 * (-5)
B = 32x^2 - 40x - 44x + 55
B = 32x^2 - 84x + 55
J =(3 - 2x)au carré
J = 3^2 - 2* 3 * 2x + (2x)^2
J = 9 - 12x + 4x^2
O = (5x-8)(5x - 7)
O = 5x * 5x - 5x * 7 - 8 * 5x - 8 * 7
O = 25x^2 - 35x - 40x + 56
O = 25x^2 - 75x + 56
A = (5x + 1)au carré
A = (5x)^2 + 2 * 5x * 1 + 1^2
A = 25x^2 + 10x + 1
