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Question
Expand the following, using suitable identities.
(a2 + b2)2
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Solution
We have,
(a2 + b2)2 = (a2)2 + (b2)2 + 2a2 × b2 ...[Using the identity, (a + b)2 = a2 + b2 + 2ab]
= a4 + b4 + 2a2b2
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