Question

if a=6 root35 then find the value of a^2-1/a^2

Answer 1

1587599/1260 is the answer
Explanation
a^2=36 x 35
a^2-1/a^2
=(36x35) -1/36x35
=1260-1/1260
=(1260x1260-1)/1260
=(1587600-1)/1260
=1587599/1260