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  •  If the chord subtends a right angle at the vertex of the parabola <img

 If the chord \mathrm{y=m x+c} subtends a right angle at the vertex of the parabola \mathrm{\mathrm{y}^{2}=4 \mathrm{ax}}, then the value of \mathrm{\mathrm{c}} is 

Option: 1

\mathrm{-4 a m}


Option: 2

4 \mathrm{am}


Option: 3

-2 \mathrm{am}


Option: 4

2 \mathrm{am}


Answers (1)

best_answer

\mathrm{y^{2}-4 a x\left(\frac{y-m x}{c}\right)=0}

Coefficient of \mathrm{x^{2}+} Coefficient of \mathrm{y^{2}=0 \Rightarrow c=-4 a m}.

Hence (C) is the correct answer.

Posted by

vishal kumar

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