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  • If the x – intercept of a focal chord of the parabola  is 3.

If the x – intercept of a focal chord of the parabola y^2=8 x+4 y+4 is 3., then the length of this chord is equal to

Option: 1

16


Option: 2

__


Option: 3

__


Option: 4

__


Answers (1)

best_answer

\begin{aligned} & y^2=8 x+4 y+4 \\ & (y-2)^2=8(x+1) \\ & y^2=4 a x \\ & a=2, X=x+1, Y=y-2 \end{aligned}

focus (1,2)

\\y-2=m(x-1)

Put (3, 0) in the above line

m=-1

Length of focal chord = 16

Posted by

Deependra Verma

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