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Question
Expand the following, using suitable identities.
`(4/5a + 5/4b)^2`
Solution
We have,
`(4/5a + 5/4b)^2 = (4/5 a)^2 + (5/4b)^2 + 2 xx 4/5a xx 5/4 b` ...[Using the identity, (a + b)2 = a2 + b2 + 2ab]
= `16/25a^2 + 25/16b^2 + 2ab`
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