Помогите решить :(10p+7q)(7q-10p)

Question

Помогите решить :
(10p+7q)(7q-10p)

Answer 1

(10p+7q)(7q-10p)=70pq + 49p^2 - 70pq - 100p^2=49q^2 - 100p^2

Answer 2

70pq-10p2+49q2-70pq=-10p2+49q2