Odpowiedź:
a. (2x+7y)(3x-6)=
6x²-12x+21xy-42y
b. (3w-5)(w-8)=
3w²-24w-5w+40=
3w²-29w+40
c. (-4u-3)(5-8u)=
-20u+32u²-15+24u=
32u²+4u-15
d. (a+2)(a-1)+(a-6)(a+5)=
a²-a+2a-2+a²+5a-6a-30=
2a²-32
e. (x+2)(x²-2x+1)=
x³-2x²+x+2x²-4x+2=
x³-3x+2
f.-2x(3x-4y)-(x+2y)(5x-y)=
-6x²+8xy-(5x²-xy+10xy-2y²)=
-6x²+8xy-5x²-9xy+2y²=
-11x²+2y²-xy
Szczegółowe wyjaśnienie:
