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Question
Factorise the following using appropriate identity:
9x2 + 6xy + y2
Solution
9x2 + 6xy + y2
= (3x)2 + 2(3x)(y) + (y)2
= (3x + y)2 ...[x2 + 2xy + y2 = (x + y)2]
= (3x + y)(3x + y)
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