(-3a+2b)(a-2b-1)+4a²+2a=-3a(a-2b-1)+2b(a-2b-1)+4a²+2a=-3a²+6ab+3a+2ab-4b²-2b+4a²+2a=a²+8ab+5a (x+y)(x²-xy+y²)=x(x²-xy+y²)+y(x²-xy+y²)=x³...