Question

if x=2+√5, find the value of (x-1/x)³​

Answer 1

Step-by-step explanation:

x=2+√5

1/x=2-√5/(2+√5)*(2-√5)

1/x=2-√5/4-5

=√5-2

(2+√5-√5+2)^3=4^3=64