If the volume of a cube is 512 cm³, then the measure of the main diagonal of the cube will be:
7\(\sqrt{3}\) cm
14\(\sqrt{3}\)​ cm
17\(\sqrt{3}\)​ cm
8\(\sqrt{3}\)​ cm
If x − \( \frac{1}{x} \) = 6, then the value of x³ − \( \frac{1}{x^3} \) is: