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7. Algebraic Expression, Identities and Factorisation
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Q84 of 128 Page 224

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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Questions · 128
7. Algebraic Expression, Identities and Factorisation
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