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Question
Expand : (5x + 3y)3
Sum
Solution
(5x + 3y)3
= (5x)3 + (3y)3 + 3 (5x) (3y) (5x + 3y)
= 125x3 + 27y3 + 45xy (5x + 3y)
= 125x3 + 27y3 + 225x2y + 135xy2
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Cubes of Binomials
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