Question

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

Answer 1

Answer:

4

Step-by-step explanation:

a=2+√3

Then,

1/a=1/(2+√3)

   =(2-√3)/(2+√3)(2-√3)                        [Rationalising]

   =(2-√3)/(4-3)

  =2-√3

So,

a - 1/a=2+√3+2-√3

        =4