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Question
Find the volume of the cube whose side is (x + 1) cm
Sum
Solution
Given side of the cube = (x + 1) cm
Volume of the cube = (side)3 cubic units = (x + 1)3 cm3
We have (a + b)3 = (a3 + 3a2b + 3ab2 + b3) cm3
(x + 1)3 = (x3 + 3x2(1) + 3x(1)2 + 13) cm3
Volume = (x3 + 3x2 + 3x + 1) cm3
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