circle

The geometric "power of a point" theorem states that, for this figure:

 

     GH · GU  =  GF · GE     --->     (x - 2)(x - 2 + 15)  =  (x - 3)(x - 3 + 19)

                                                           (x - 2)(x + 13)  =  (x - 3)(x + 16)     

 

Can you finish?