Bonjour,
K(a-b)=Ka-Kb
* = fois
^2 = puissance 2
Donc,
A = 7 * (x-3)
A = (7 * x) - (7 * 3)
A = 7x - 21
B = -5 * (3-x)
B = (-5*3) - (-5*x)
B = -15 - (-5x)
B = -15 + 5x
C = 2 * (3x + 6)
C = (2*3x) + (2*6)
C = 6x + 12
D = -4 * (-2x -3)
D = (-4*-2x) - (-4 *3)
D = 8x + 12
E = 3x * (5x-1)
E = (3x * 5x) - (3x * -1)
E = 15x^2 - 3x
F = x * (x + y)
F = (x*x) + (x*y)
F = x^2 + x*y
Voilà, j'espère t'avoir aidé ! Bon courage et bonne journée !
