Add: p(p - q), q(q - r) and r(r - p). - Vidyadip

Question

Add: $p(p - q), q(q - r)$ and $r(r - p).$

✓

Answer

$p(p - q) + q(q - r) + r(r - p)$
$=p^{2}-p q+q^{2}-q r+r^{2}-r p$
$=p^{2}+q^{2}+r^{2}-p q-q r-r p$

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