Question

evaluate the following using suitable identities .1. (98)³​

Answer 1

Answer:

941192

Step-by-step explanation:

98³ can be written as (100-2)³

So, we'll use the identity.

(a-b) ³=a³-b-3a²b+3ab²

(100-2)³=100³-2³-3(100)²(2)+3(100)

=1000000-8-60000+1200

=941192

=98³=941192

Answer 2

Here's your answer

Step-by-step explanation:

98= 100-2

Using identity [a-b]^3 =a^3 -b^3-3ab[a-b]

Where a=100 and b=2

= [100]^3 -[2]^3 -[100][1] [100-2]

= 1000000-8-300[100-2]

=1000000-8-30000-600

= [-2006008]

Hope it helps you.