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#1 2007-05-05 09:15:57

jdo42424
Member
Registered: 2007-05-05
Posts: 0

Equation of a parabola

find equation of a parabola with the given conditions

Vertex V(-2,3)

directrix y=5

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#2 2007-05-05 10:36:33

Stanley_Marsh
Member
Registered: 2006-12-13
Posts: 345

Re: Equation of a parabola

you must know that the distance between  directrix and vertex equal vertex to focus.

then we can locate , that the focus is F=( -2 ,1 )

Also , any point on this parabola ,say P . The distant between P to F is equal to P to directrix

so

Last edited by Stanley_Marsh (2007-05-05 10:36:45)


Numbers are the essence of the Universe

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