Question

if x=3-2√3 then x²-1/x²

Answer 1

Given x = 3 -2√3
x²-1/x²={3-2√3}² - 1/ (3-2√3)²

Answer 2

if x=3-2√3 then x²-1/x²

= x²-1/x²

x = 3 - 2√3

x²-1/x² = (3 - 2√3)²-1/(3 - 2√3)²

           =-3 - 1/-3

           =(-9 + 1)/3

           = -8/3