Question

add : P(P-Q),Q(Q-r)andR(R-P)​

Answer 1

=p2+q2+r2−pq−qr−rp Explanation: p(p−q)+q(q−r)+r(r−p) Opening the brackets: =p2−pq+q2−qr+r2−rp =p2+q2+r2−pq−qr−rp Hope this helps! :)