parabola: please help me

2 Answers

1357

Manish Shankar ·2009-04-03 04:40:22

y=mx-2am-am³ is the equation of normal from a point
let the point be (h,k)
m₁+m₂+m₃=0
and m₁m₂m₃=-k/a

m₁m₂=-1

m₃=k/a

put m=k/a in the normal equation

you will get the answer

thanks sir thanks a lot.....................

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