‘t1’ And ‘t2’ Are Two Points On The Parabola y2 = 4x. If The Chord Joining Them Is A Normal To The Parabola At ‘t1’ Then

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Question

t1’ and ‘t2’ are two points on the parabola y2 = 4x. If the chord joining them is a normal to the parabola at ‘t1’ then

Solution

Correct option is

t1(t1 + t2) + 2 = 0

The equation of chord is 

        

Now slope of normal at ‘t1’ is – t1. So chord will be normal att1if

            

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