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Question
Multiply the following:
(pq – 2r), (pq – 2r)
Sum
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Solution
We have,
(pq – 2r) and (pq – 2r)
∴ (pq – 2r)(pq – 2r) = pq(pq – 2r) – 2r(pq – 2r)
= p2q2 – 2pqr – 2rpq + 4r2
= p2q2 – 4pqr + 4r2
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Chapter 7: Algebraic Expression, Identities and Factorisation - Exercise [Page 231]
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