Bonjour
Factoriser
(x+1)²-(2x+3)²
= (x + 1 + 2x + 3) (x + 1 - 2x - 3)
= (3x + 4) (-x - 2)
Réponse:
x^2 +2x+1-(4x^2+12x+9)=-3x^2-10x-8
