Question

If x = 5 root2 − 7, find the value of x^3-1/x^3
tell me fast​

Answer 1

Step-by-step explanation:

$\frac{(5 \sqrt{2}) ^{3} - 1 }{(5 \sqrt{2} ^{3} } \\ \frac{125 \times 2 \sqrt{2} - 1}{125 \times 2 \sqrt{2} } \\ \frac{250 \sqrt{2} - 1 }{250 \sqrt{2} }$