Question

please solve this
image

Answer 1

We know that,

a³−b³=(a−b)³ +3ab(a−b)

Here,

a=x

b=1/x

Substitute these values in the above equation.

x³-1/x³= (x-1/x)³+3(x-1/x)

=(3³)+3(3)

=27+9

= 36

Hence, the required answer is 36