Question

classmate Data Page Expand cube of ga cusing the expansion formula. expand cube of 99 by using the expansion formula
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Answer 1

Step-by-step explanation:

Correct option is

A

970299

We have,

(99)

3

=(100−1)

3

We know that

(a−b)

3

=a

3

−b

3

−3ab(a−b)

Therefore,

=(100)

3

−1

3

−3×100×1×(100−1)

=1000000−1−300(100−1)

=1000000−1−30000+300

=970299

Hence, this is the answer.