Exercices 96, 98 et 99 SVP URGENT merci beaucoup.

Exercice 96 A.(3x-1)^2-(2x+1)^2 =a^2-b^2=(a+b)(a-b) Donc A=(3x-1+2x+1)(3x-1-(2x+1) =(5x)(x-2)=5x^2-10x B=(x+4)^2-(2x-6)^2 B=(x+4+2x-6)(x+4-(2x-6)) B=(3x-2)(-x+10) B=-3x^2+30x+2x-20 B=-3x^2+32x-20