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Exercice 1 : Factorise les expressions suivantes :
A= 3(x + 3) + x(x + 3)
B = x2-9
C= 4x2 - 10x + 25
D= (2x + 7) (x - 2) + (2x + 7) (3x + 4)
E= (x - 2)( 4x - 1) + (x - 2)(x + 3)
F =(4 - x)(2x + 1) - (2x + 1)2
G=25x2 - 36
H= 16x2 - 8x +1
I = 25 - (x + 1)2
J= (x + 1) (x - 2) - 3x(x + 1)
K = 4 - 4x2
L = (3x+5)2 - (x-2)