Sarthaks Test
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Write the following cubes in expanded form:

(i) (2x + 1)3

(ii) (2a - 3b)3

(iii)[3/2x + 1]3

(iv) [x - 2/3y]3

1 Answer

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Best answer

It is known that,

(a + b)3 = a3 + b3 + 3ab(a + b)

and (a- b)3 = a3 - b3 -3ab(a - b)

(i) (2x + 1)3 = (2x)3 + (1)3 + 3(2x)(1)(2x + 1)

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