Question

simplify p (p-q) , q (q-r) and r (r-p)

Answer 1

p[p-q]
    2
=P  - qp

q[q-r]
=q2 - qr

r[r-p]
    2 
=r    - pr

Answer 2

p(p-q)
= p²-pq

q(q-r)
= q²-qr

r(r-p)
= r² - rp