Question

evaluate the following by using a suitable Identity: 98³​

Answer 1

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

Answer:

98³

( 100 - 2 )³

Now

(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

Thank you! ❤