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January 24th, 2016, 06:30 PM  #1 
Senior Member Joined: Jul 2011 Posts: 405 Thanks: 16  focus and equation of directrix of Parabola
If $\displaystyle A(4,2)$ and $\displaystyle (0,1)$ be two point on the parabola Normals at which intersect at $\displaystyle P(2,2)$ Then equation of directrix and focus of parabola is 
January 25th, 2016, 10:37 AM  #2 
Senior Member Joined: May 2008 Posts: 301 Thanks: 81  Beer soaked ramblings follow. What have you done so far? 
January 25th, 2016, 04:47 PM  #3 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038 
No hankypanky? 

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directrix, equation, focus, parabola 
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