Question

p(p-q) q(q-r) and r(r-p)​

Answer 1

$\sf \: p(p−q),q(q−r),r(r−p)$

$\sf \: ⇒p(p−q)+q(q−r)+r(r−p)$

$\sf \: ⇒p2−pq+q2−qr+r2−rp$

$\sf \: Thus \: the \: sum \: \\ \sf =p2+q2+r2−pq−qr−pr$

Answer 2

Answer:

P(p-q)=p2-pq

q(q-r)=q2-qr

r(r-p)=r2-rp

Adding expressions

p2-pq

+q2-qr

+r2-rp

___________________

p2-pq+q2-qr+r2-rp

___________________