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Mathematics

By using suitable identities, evaluate the following:

(99)3

Expansions

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Answer

(99)3 = (100 - 1)3

Using (a - b)3 = a3 - b3 - 3(a)(b)(a - b),

(100 - 1)3 = (100)3 - (1)3 - 3(100)(1)(100 - 1)

= 1000000 - 1 - 300(99)

= 1000000 - 1 - 29700

= 970299

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