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Question
Expand the following:
(x + 3y)2
Sum
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Solution
Given expression: (x + 3y)2
Stepwise calculation using the algebraic identity (a + b)2 = a2 + 2ab + b2:
(x + 3y)2 = x2 + 2 × x × 3y + (3y)2
(x + 3y)2 = x2 + 6xy + 9y2
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