If x = 1/x = 7, then x^3 +1/(x^3) is equal to :

We know that,

If x + \(\frac{1}{x}\)  = n

then, $x^3 +\frac{1}{x^3}$ = n³ - 3 × n

If $x = \frac{1}{x} = 7, $

then $x^3 +\frac{1}{x^3}$ = 7³ - 3 × 7 = 343 - 21 = 322