aider moi svpp c'est pour demain

Bonsoir Malak50,

1) développer et réduire :

A = 5x - 3(2x + 5)
A = 5x - 3 * 2x - 3 * 5
A = 5x - 6x - 15
A = -x - 15

B = (x - 2)² + 4(x - 1)
B = x² - 4x + 4 + 4x - 4
B = x²

C = (x + 1)(x - 1) + 2x + 3
C = x² - x + x - 1 + 2x + 3
C = x² + 2x + 2

D = 8x + 3 - (4x + 2)
D = 8x + 3 - 4x - 2
D = 4x + 1

2) Factoriser :

E = 4x - 32
E = 4 * x - 4 * 8
E = 4(x - 8)

F = x² + 2x + 1
F = (x)² + 2 * x * 1 + 1²
F = (x + 1)²

G = (a - 2)² + (2a + 3)(a - 2)
G = (a - 2)(a - 2 + 2a + 3)
G = (a - 2)(3a + 1)

H = (3x + 2)(x + 5) - x(2x + 10)
H = (3x + 2)(x + 5) - 2x(x + 5)
H = (x + 5)(3x + 2 - 2x)
H = (x + 5)(x + 2)