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Question
Expand the following, using suitable identities.
(2x – 5y)(2x – 5y)
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Solution
We have,
(2x – 5y)(2x – 5y) = (2x – 5y)2
= (4x)2 + (5y)2 – 2 × 2x × 5y ...[Using the identity, (a – b)2 = a2 + b2 – 2ab]
= 16x2 + 25y2 – 20xy
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