Question

Using suitable indentitly :find (98)3

Answer 1

(100-2)^3
(100)^3-(2)^3-3 (100)(2)(100+2)
1000000-8-3 (200)(102)
1000000-8-3 (20400)
999992-61200
938792
hope it will help you

Answer 2

Answer:

941192

Step-by-step explanation:

(98)³ can be written as (100-2)³

so by using identity

identity=(a-b)³=a³-b³-3a²b+3ab²

a=100

b=2

=100³-2³-3(100)²(2)+3(100)(2)²

1000000-8-60000+1200

=941192

hence (98)³=941192