bonjour
a)(x-3)(2x+1)+(x-3)(5x-7)
(x-3)(2x+1+5x-7)
(x-3)(7x-6)
b)(5x-6)(11x+6)+8(11x+6)
(11x+6)(5x-6+8)
(11x+6)(5x+2)
c)(7x²-5)(3x+9)+(7x-12)(3x+9)
(3x+9)(7x²-5+7x-12)
(3x+9)(7x²+7x-17)
3(x+3)(7x²+7x-17)
d)(8x-5)(14x+5)+(14x+5)²
(14x+5)(8x-5+14x+5)
22x(14x+5)
ex 13
a)(2x-3)(x+2)-5(2x-3)
(2x-3)(x+2-5)
(2x-3)(x-3)
b)(5x+1)(3x-5)-(x-3)(5x+1)
(5x+1)(3x-5-x+3)
(5x+1)(2x-2)
2(x-1)(5x+1)
c)(3x+2)(-5x-7)-(3x+2)(x+7)
(3x+2)(-5x-7-x-7)
(3x+2)(-6x-14)
-2(3x+7)(3x+2)
d)(5x-8)(7x-3)-(7x-3)²
(7x-3)(-7x+3+5x-8)
(7x-3)(-2x-5)
