Question

rationalize the denominator √3-1/√3+1

Answer 1

(√3-1)2 / (3 - 1) = (3 + 1 - 2√3) / 2 = 2 - √3.
Similarly do remaining problems.

Answer 2

{(√3-1)*(√3-1)}/{(√3+1)(√3-1)}

(√3-1)²/(√3)²-1²

(3+1-6)/2

4-6/2

-2/2

-1

I hope this will help you