1] 9x²-16+(3x+4)(3x-2)
= (3x+4)(3x-4)+(3x+4)(3x-2)
= (3x+4)(3x-4+3x-2)
= (3x+4)(6x-6)
= 6(3x+4)(x-1)
2] (4x-1)²-(x-5)²
= [(4x-1)-(x-5)][(4x-1)+(x-5)]
= (3x+4)(5x-6)
3] (7x-5)(3x+2)-6(3x+2)(x+3)
= (3x+2)(7x-5-6x-18)
= (3x+2)(x-23)
4] (2x+3)(2x-1)+4x²+12x+9
= (2x+3)(2x-1)+(2x+3)²
= (2x+3)(2x-1+2x+3)
= (2x+3)(4x+2)
= 2(2x+3)(2x+1)
5] (6x-1)²-(7x+2)²
= (6x-1-7x-2)(6x-1+7x+2)
= (-x-3)(13x+1)
= -(x+3)(13x+1)
Voilà et pour le poutou tu peux t´abstenir
