Question

Evaluate the following using suitable identities (i) (98)³ (ii) (101)³​

Answer 1

Answer:

1st answer

98³ can be written as (100-2)³

So, we'll use the identity -

(a-b)³= a³-b³-3a²b+3ab²

(100-2)³ = 100³ - 2³ - 3(100)²(2) + 3(100)(2)²

             = 1000000 - 8  - 60000 + 1200  

             = 941192  

Answer - 98 ³ = 941192

Answer 2

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