P and Q are the points with parameters p and q on the parabola If pq = 1 and S is the focus of the parabola, show that 1/SP + 1/SQ = 1/a Thanks
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Originally Posted by deltaxray P and Q are the points with parameters p and q on the parabola If pq = 1 and S is the focus of the parabola, show that 1/SP + 1/SQ = 1/a The focus is at . If and then and so . Similarly . Then . If then you can write the numerator as , so the fraction simplifies to .
Thank you
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