Question

if a=2+√3 find a-1/a​

Answer 1

Answer:

a=2+√3

1/a= 1/(2+√3)

1/a= (2-√3)/(2+√3)(2-√3)

1/a= (2-√3)/(4-3)

1/a= (2-√3)

so, (a-1/a)= (2+√3)-(2-√3) = 2√3