hey y'all,

I got a question (obviously)

"By expressing as a quadratic in the term , show ."

This is my worked solution for the quadratic part:

And now for the inverse part:

I get stuck i know the answer is (from the question) and i know somewhere in the calculations there is some sort of logarithm cancellation i.e.

Can someone help? and can you tell me if my quadratic expression is incorrect? thanks