Factoriser les expressions suivantes : A=3(2x-6)-(x-3)(x+7)+3x-9 B=5(x-1)+(x-1)(3x+2)+4x-4 C=7(2x+3)+(2x+3)(2x+3)-(2x+3)(5x-1) J'aurai besoin d'aide svp

[tex]A=3(2x-6)-(x-3)(x+7)+3x-9\\A=6(x-3)-(x-3)(x+7)+3(x-3)\\A=(x-3)(6-x-7+3)\\\\\boxed{A=(x-3)(-x+2)}\\ \\ B=5(x-1)+(x-1)(3x+2)+4x-4\\B=5(x-1)+(x-1)(3x+2)+4(x-1)\\B=(x-1)(5+3x+2+4)\\\boxed{B=(x-1)(3x+11)}\\ \\ C=7(2x+3)+(2x+3)(2x+3)-(2x+3)(5x-1)\\C=(2x+3)(7+2x+3-5x+1)\\\boxed{C=(2x+3)(-3x+11)}[/tex]