5(1-y)^2-(3+y)^2-3(1-y)(1+y)

Question

5(1-y)^2-(3+y)^2-3(1-y)(1+y)

Answer 1

=5(1-2у+у²)-(9+6у+у²)-3(1-у²)=
=5-10у+5у²-9-6у-у²-3+3у²=
=-16у+7у²-7

Comments

в ответе в начале -16у или просто 16у??