anonymous
  • anonymous
Write the equation of a parabola with a vertex at (-3, 7) and a directrix x = -8
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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dan815
  • dan815
|dw:1436317762129:dw|
dan815
  • dan815
do you know what is special about the directrix
anonymous
  • anonymous
it's parallel to whichever is squared

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dan815
  • dan815
@taramgrant0543664
dan815
  • dan815
i have to go for a bit, she might help you
dan815
  • dan815
this will get you started, the main this is that the length from the focus to the parabola and the perpendicular length from the directrix to the parabola is the same
dan815
  • dan815
|dw:1436318152545:dw|
dan815
  • dan815
|dw:1436318196480:dw|
dan815
  • dan815
not drawn to scale but that relationship is always true
dan815
  • dan815
from the focus to the parabola is the same distance as the perpendicular distance from the directrix to a point on the parabola
dan815
  • dan815
see if you can think of idea to solve for your parabola equation y=ax^2+bx+c
anonymous
  • anonymous
x+3=1/20(y-2)^2

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