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प्रश्न
Simplify:
(pq – qr)2 + 4pq2r
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उत्तर
We have,
(pq – qr)2 + 4pq2r = p2q2 + q2r2 – 2pq2r + 4pq2r ...[Using the identity, (a – b)2 = a2 + b2 – 2ab]
= p2q2 + q2r2 + 2pq2r
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