Question

Add p ( p-q) q (q-p) r (r-p)

Answer 1

Hope it's correct because didn't put any kind of sign it punctuation in the question....

Hope it helps!!!

Answer 2

p (p-q) + q (q-p) + r (r-p)
p2-pq + q2-pq + r2-rp
p2+q2+r2-p(p+ 2q)