Question

multiply (p+q+r)(p-r) answer in long​

Answer 1

Answer:

$p ^{2} + pq + rp - rp - rq + r ^{2}$

+rp-rp can be cancelled

then, p2+pq-rq+r2

Answer 2

answer:

(p+q+r)(p-r)

=p(p-r)+q(p-r)+r(p-r)

=p^2 -pr+pq-qr+pr-r^2

=p^2-r^2+pq-pr-qr

=p^2-r^2+pq-r(p+q)