The solution way with an example.

Very nice, Omi......but.....I'm looking for a more general solution........the tangent line could be at any point on the parabola........

I didn't mean for the diagram to have any specific numerical values for the vertices of triangle .........see if you can prove this in an abstract manner.......

I'll give you my 5 points Omi       

Chris can be stingy with his points.                LOL

Here is the question.    

http://web2.0calc.com/questions/cphill-s-challenge#r2