Bonsoir j’ai besoin d’aide svp cst à rendre demain je m’y mes un peut tard mais bon ...

Exercice 1 :

A = x(3x-2)+4x-5x(3x-1)
A = 3x²-2x+4x-15x²+5x
A = -12x²+7x

B = 2x+4-(8x-9)
B = 2x+4-8x+9
B = -6x+13

C = 6x²+2x(x+3)+(2x-3)
C = 6x²+2x²+6x+2x-3
C = 8x²+8x-3

D = 3x²+(2x+3)(5-4x)-12
D = 3x²+10x-8x²+15-12x-12
D = -5x²-2x+3

E = (6x-3)(2x-9)
E = 12x²-18x-6x+27
E = 12x²-24x+27

Exercice 2 :

a) A = 0²+2-3(0+4)
A = 2-12
A = -10

b) A = (-4)²+2-3((-4)+4)
A = 16+2
A = 18

c) A = 1²+2-3(1+4)
A = 1+2-3*5
A = 1+2-15
A = -12

Exercice 3 :

a) 7x²-5x
⇔ x(7x-5)

b) 6x+36x²
⇔ x(36x+6)
⇔ 6x(6x+1)

c) 2x²+8x³
⇔ x(8x²+2x)
⇔ x²(8x+2)
⇔ 2x²(4x+1)