1.

Evaluate (998)^3 without multiplying directly.Please help me fast , it's urgent...​

Answer»

Here is ur answer :

We have (998)3 = (1000 – 2)3

Using IDENTITY (x – y)3 = x3 – Y3 – 3xy(x – y) we get

(1000 – 2)3 = 10003 – 23 – 3(1000)(2)(1000 – 2)

= 1000000000 – 8 – 5988000

= 994011992

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