Question

7.Subtract:
a)2ab+5bc-7ac from 5ab-2bc-2ac+10abc.
b)7p(3q+7p) from 8p(2p-7q).
c)-3p2+3pq+3px from
3p(-p-a-r).

Answer 1

Hope this helps you
and thank you

Answer 2

$\rm{b]\:8p\left(2p-7q\right)-7p\left(3q+7p\right)=16p^2-56pq-7p\left(3q+7p\right)}$

$\longrightarrow\rm{8p\left(2p-7q\right)-7p\left(3q+7p\right)=16p^2-56pq-21pq-49p^2}$

$\longrightarrow\rm{8p\left(2p-7q\right)-7p\left(3q+7p\right)=16p^2-49p^2-56pq-21pq=-33p^2-77pq}$