Odpowiedź :
Odpowiedź:
(10x+8)(-5x-2)=-50x^2-20x-40x-16=-50x^2-60x-16
(9x+6y)(6xy-7x+7y)=
=54x^2y-63x^2+63xy+36xy^2-42xy+42y^2=
=-63x^2+54x^2y+36xy^2+21xy+42y^2
Odpowiedź:
(10x+8)(-5x-2)=-50x^2-20x-40x-16=-50x^2-60x-16
(9x+6y)(6xy-7x+7y)=
=54x^2y-63x^2+63xy+36xy^2-42xy+42y^2=
=-63x^2+54x^2y+36xy^2+21xy+42y^2