Multiply the following: (pq - 2r), (pq - 2r) - Vidyadip

Question

Multiply the following: $(pq - 2r), (pq - 2r)$

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Answer

$(pq - 2r), (pq - 2r)$
$(pq - 2r)(pq - 2r)$
$= pq(pq - 2r) - 2r(pq - 2r)$
$ =p^2 q^2-2 p q r-2 r p a+4 r^2 $
$ =p^2 q^2-4 p q r+4 r^2 $

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