7a^2(a-x)+(6a^2-ax)(x-a) 11b^2(3b-y)-(6y-3b^2)(y-3b)

Question

7a^2(a-x)+(6a^2-ax)(x-a)
11b^2(3b-y)-(6y-3b^2)(y-3b)

Answer 1

7a²(a-x)+(6a²-ax)(x-a)=7a³-7x+6a²x-6a³-ax²-a²x=a³-7x+5a²x-ax².
11b²(3b-y)-(6y-3b²)(y-3b)=11b³-11b²y-6y²+18by+3b²y-9b³=2b³-8b²y-6y²+18by.