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Question
Find the cube of : 5a + 3b
Sum
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Solution
( a + b )3 = a3 + 3ab( a + b ) + b3
( 5a + 3b)3 = (5a)3 + 3 x 5a x 3b( 5a + 3b) + (3b)3
= 125a3 + 45ab( 5a + 3b ) + 27b3
= 125a3 + 225a2b + 135ab2 + 27b3
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