Question

x+1/x=3 then x*x*x+1/x*x*x​

Answer 1

Answer:

acc. to my solution , it must be 4/22

Answer 2

Answer:-

Given,

$\sf x + \frac{1}{x} = 3$

So,

$\sf {x}^{3} + \frac{1}{ {x}^{3} }$

$\sf = {(x + \frac{1}{x} )}^{3} - 3 \times x \times \frac{1}{x} (x + \frac{1}{x} )$

$\sf = {3}^{3} - 3 \times 3$

$\sf = 27 - 9$

$\sf = 18$

Hence,

$\sf {x}^{3} + \frac{1}{ {x}^{3} } = 18$