Question

if a=2+✓3, then find the value of a-1/a​

Answer 1

here is the correct answer

Answer 2

a=2 + √3

1/a = 1/ 2+ √3 (let's rationalise)

=> 2- √3

now a - 1/a = (2 + √3) - (2-√3)

=> 2√3 ( 2 and -2 cancels)