Exercice 1 et 2. C'est sur la factorisation

a = 4x+2
a = 2(2x+1)

b = 5x²-3x
b = x(5x-3)

c =(x+1)(2x-5) +(x-2)(x+1)
c =(x+1)(2x-5+x-2)
c =(x+1)(3x-7)

d =(3x-2)² -(3x-2)(5x-1)
d =(3x-2)(3x-2-5x+1)
d= (3x-2)(-2x-1)

e =(4x-5)(x-3)+(4x-5)²
e =(4x-5)(x-3+4x-5)
e =(4x-5)(5x-8)


a = x²+10x+25
a =(x+5)²

b=x²-2x+1
b =(x-1)²

c =x²-16
c =(x-4)(x+4)

d =4x²+24x+36
d =(2x+6)²

e = 16x²-40x+25
e =(4x-5)²

f = 25x²-36
f = (5x-6)(5x+6)