how to solve this question? x3+1|x3 where x=2+root 3 in this x3 is x cube.

Use the identity a³ + b³ = (a + b)(a² - ab + b²)

 

So, x³ + 1/x³ = (x + 1/x)(x² - 1 + 1/x²)

Now, find the required values and substitute in the above equation.