Question

add p(p-r) +q(q-r) +r(r-p)

Answer 1

p (p-r)+q (q-r)+r (r-p)
p^2 -pr + q^2 -qr + r^2 -rp
p^2 -2pr -qr +q^2 +r^2
Hope this helped ☺

Answer 2

Heya,  

its very simple question......

It is given ------

p(p-r) + q(q-r) + r(r-p)
= p² - pr + q² - qr + r² - rp
= p² + q² + r² - pr - pr - qr
= p² + q² + r² - qr -  2pr.

Hope it helps