Sagot :
Réponse :
Bonjour,
Exercice 2 :
D = 3(x + 8)
= 3 * x + 3 * 8
= 3x + 24
E = (x - 9) * 4
= 4 * x - 4 * 9
= 4x - 36
F = 4(4x + 7)
= 4 * 4x + 4 * 7
= 16x + 28
G = (5 - 6a) * 2b
= 2b * 5 - 2b * 6a
= 10b - 12ab
Exercice 3 :
K = 5 * x + 5 * 3
= 5(x + 3)
L = 12x - 18
= 2(6x - 9)
= 2(3(2x - 3)
= 6(2x - 3)
M = 3t² - 2t
= t(-2 + 3t)
N = -5x + 25x²
= -5x + 55xx
= 5x (-1 + 5x)
Exercice 4 :
A = (x + 3)(x + 2)
= x * x + x * 2 + 3 * x + 3 * 2
= x² + 2x + 3x + 6
= x² + 5x + 6
B = (3x + 2)(5x + 7)
= 3x * 5x + 3x * 7 + 2 * 5x + 2 * 7
= 15x² + 21x + 10x + 14
= 15x² + 31x + 14
C = (-9y - 6)(2y - 11)
= -9y * 2y - (-9)y * 11 - 6 * 2y - 6 * 11
= -18y² + 9y * 11 - 6 * 2y - 6 * 11
= -18y² + 99y - 12y + 66
= -18y² + 87y + 66