Question

Evaluate the using suitable identities.

(998)³
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Answer 1

Answer:

(998)³ = (1000-2)³

As (a-b)³= a³-3a²b +3ab² -b³

= 1000³-3.(1000)².2 +3(1000).2² -2³

= 1000000000-3.1000000.2 +3.1000.4 -8

= 1000000000-6000000+12000-8

= 994011992

There fore,

(998)³=994011992

Answer 2

Answer:

Hai,

Here is your answer,

This can be done using formula method