Question

if x= √5+√4,then (x-1/x) to the power 3?​

Answer 1

x=root5 +root4

1/x = 1/root5+root 4 =1 × (root5-root4)/root5 +root4(root5-root4)

= (x -1/x)^3

={(root5+root4) - (root5-root4)}^3

= (root4 + root4)^3

=(2+2)^3

=4^3

=64