Réponse :
bonjour
Explications étape par étape :
A = 3(7 + 2x)
=21+6x
B = x(x + 3)
=x²+3x
C = 3(2x - 5)
=6x-15
D* = x(x + 6) + 3(x - 5)
=x²+6x+3x-15
=x²+9x-15
E* = x(2x - 3) - 2(2x + 3)
=2x²-3x-4x-6
=2x²-7x-6
Factoriser:
F = 7x + 21
=7(x+3)
G= x - 3x.
=-2x
H= 16x-20
=4(4x-5)
I= 4x2 - 5x
=x(4x-5)
J* = (x + 2)(2x + 3) + (x + 2)(x + 1)
=(x+2)(2x+3+x+1)
=(x+2) (3x+4)
