These are the steps I have done thus far:Quote:

A straight line of gradient is drawn through the point on the curve . Find, in terms of , the coordinates of the point at which the line intercepts the curve again.

Let be the - intercept

Hence equation of the line is

Equating this into ,

I'm not sure how I can factorise this into the answer that is

Any help would be greatly appreciated and thank you very much in advance! :)