2у3+2(3-у)(у2+3у+9)

Question

2у3+2(3-у)(у2+3у+9)

Answer 1

2у3+2(3у2+6у+27-у3-3у3-9у)=2у3+6у2+12у+54-2у3-6у3-19у=4у2-7у+54-8у3=-8у3+4у2-7у+54=4у2(-2у+1)-7(у-1)