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Question
Expand : (x + 5y)3
Sum
Solution
(x+ 5y)3 = (x)3 + (5y)3 + 3× x × 5y (x + 5y)
= x3 + 125y3 + 15xy (x + 5y)
= x3 + 125y3 + 15x2y + 75xy2
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Cubes of Binomials
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