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Question
Find the following squares by suing the identities.
(2xy + 5y)2
Solution
(2xy + 5y)2 = (2xy)2 + 2(2xy) (5y) + (5y)2
[(a + b)2 = a2 + 2ab + b2]
= 4x2y2 + 20xy2 + 25y2
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