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Question
Expand the following, using suitable identities.
(xy + yz)2
Solution
We have,
(xy + yz)2 = (xy)2 + (yz)2 + 2 × xy × yz ...[Using the identity, (a + b)2 = a2 + b2 + 2ab]
= x2y2 + y2z2 + 2xy2z
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