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Question

The factorisation of  a3+0.027 is equal to
  1. (a+0.3)(a2+0.3a+0.09)
  2. (a+0.3)(a20.3a+0.09)
  3. (a0.3)(a20.3a+0.09)
  4. (a0.3)(a20.3a+0.09)


Solution

The correct option is B (a+0.3)(a20.3a+0.09)
The given expression is a3+0.027
It can be written as
a3+0.33
= (a+0.3) (a20.3a+0.32)   ....[a3+b3=(a+b)(a2ab+b2)]
(a+0.3) (a20.3a+0.09)

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