Bonjour
Charlie9
[tex]A=x^3-12x^2\Longrightarrow\boxed{A=x^2(x-12)}\\\\B=x(1-x)+(x-1)(x+2)\\\\B=x(1-x)-(1-x)(x+2)\\\\B=(1-x)[x-(x+2)]\\\\B=(1-x)(x-x-2)\\\\B=(1-x)\times(-2)\\\\\boxed{B=-2(1-x)}[/tex]
[tex]C=(5x+1)(-3x+4)+x(10x+2)\\\\C=(5x+1)(-3x+4)+2x(5x+1)\\\\C=(5x+1)[(-3x+4)+2x]\\\\C=(5x+1)(-3x+4+2x)\\\\\boxed{C=(5x+1)(-x+4)}\\\\ou\\\\C=(5x+1)(-3+4x)+x(10x+2)\\\\C=(5x+1)(-3+4x)+2x(5x+1)\\\\C=(5x+1)[(-3+4x)+2x]\\\\C=(5x+1)(-3+4x+2x)\\\\C=(5x+1)(6x-3)\\\\\boxed{C=3(5x+1)(2x-1)}[/tex]