Bonsoir
A=(3x+7) (2x+1) + (x+8) (2x+1)
B=(x-3) (2x-7) - (2x-7) (2x-5)
C=(6x-3) (3x-5) - (6x-3)²
Calculer A pour x=4;
A=(3x+7) (2x+1) + (x+8) (2x+1)
A = (3 * 4 + 7)(2 * 4 + 1) + (4 + 8)(2 * 4 + 1)
A = (12 + 7)(8 + 1) + 12 * (8 + 1)
A = 19 * 9 + 12 * 9
A = 171 + 108
A = 279
B pour x=-2;
B=(x-3) (2x-7) - (2x-7) (2x-5)
B = (-2 - 3)(2 * (-2) - 7) - (2 * (-2) - 7)(2 * (-2) - 5)
B = (-5) * (-4 - 7) - (-4 - 7)(-4 - 5)
B = -5 * (-11) - (-11) * (-9)
B = 55 - 99
B = -44
C pour x=0
C=(6x-3) (3x-5) - (6x-3)²
C = (6 * 0 - 3)(3 * 0 - 5) - (6 * 0 - 3)^2
C = (-3) * (-5) - (-3)^2
C = 15 - 9
C = 6
