Question

the sum of p(p-q) and q(q-r) is ____​

Answer 1

$p(p - q) + q(q - r) \\ \\ = { p}^{2} + {q}^{2} - q(p + r) \\ \\ = { p}^{2} + {q}^{2} - pq - qr$

hope it helps

Answer 2

Answer:

Step-by-step explanation:

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

=p²-pq+q²-qr

=p²+q²-pq-qr

=p²+q²-q(p+r)