If $a+\frac{1}{a}=5$ then $a^3+\frac{1}{a^3}$ is:

110 10 80 140

110

If x + \(\frac{1}{x}\)  = n then, $x^3 +\frac{1}{x^3}$ = n3 - 3 × n If $a+\frac{1}{a}=5$ $a^3+\frac{1}{a^3}$ = 53 - 3 × 5 = 110