Question

Subtract 3p-2q+r from mp+2q and and add the result of p2-3p3+p-r​

Answer 1

mp+2q-(3p-2q+r)

=mp+2q-3p+2q-r

=mp+4q-3p-r

Now, add

(p2-3p3+p-r)+(mp+4q-3p-r)

=-3p3+p2+mp+4q-2p-2r