Question

slove using identity (98)3

Answer 1

98^3

= (100 - 2) ^3

[ (a-b) ^3 = a^3 - b^3 - 3ab(a - b)]

= (100)^3 - (2)^3 - 3(100)(2)( 98)

= 1000000 - 8 - ( 600 × 98)

= 1000000 - 8 - 58800

= 999992 - 58800

= 941192

Answer 2

Hola there,

=> (98)³

=> (100 - 2)³

We know : (a - b)³ = a³ - b³ - 3ab(a - b)

So,

=> (100)³ - (2)³ - 3(100)(2)(100 - 2)

=> 1000000 - 8 - 600(98)

=> 1000000 - 58808

=> 941192. ....Ans

Hope this helps...:)