Answered

DEVELOPPER  PUIS REDUIRE CHAQUE EXPRESSSION
(7x-3)(6x+1)
(-2-9x)(-4y-1)
(2x+3)(3-2x)
(-10-3a)(2a-9)

Sagot :

(7x-3)(6x+1)=42x²+7x-18x-3=42x²-11x-3
(-2-9x)(-4y-1)=8y+2+36xy+9x
(2x+3)(3-2x)=6x-4x²+9-6x=-4x²+9
(-10-3a)(2a-9)=-20a+90-6a²+27a=-6a²+7a+90