3 3---------- - -------- 2√7+1 2√7-1

Question

3 3
---------- - --------
2√7+1 2√7-1

Answer 1

  3           3
----------  -  --------
 2√7+1     2√7-1
(3(2√7-1)-3(2√7+1)).(2√7-1)(2√7+1)=(6√7-3-6√7-3)/(28-1)=-6/27=-2/9