Simplify
(pq-qr)2 + 4pq2r
The given expression is
(pq-qr)2 + 4pq2r
= (pq)2-2(pq)(qr) + (qr)2 + 4pq2r
= p2q2-pq2r + q2r2 + 4pq2r
= p2q2 + 3pq2r + q2r2
Therefore , (pq-qr)2 + 4pq2r = p2q2 + 3pq2r + q2r2
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