anonymous
  • anonymous
Find the standard form of the equation of the parabola with a focus at (7, 0) and a directrix at x = -7.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
lol this might be 12 grade work lol cuz i never heard of it
anonymous
  • anonymous
its precalc @*ImaBeMe*
anonymous
  • anonymous
do you know whats special about a focus and directrix

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anonymous
  • anonymous
kinda not really @dan915
anonymous
  • anonymous
okay basically for focus if u fire any line at into the parabola it will reflect off into the focus
anonymous
  • anonymous
ok @nanaruiz123
anonymous
  • anonymous
|dw:1440020061995:dw|
anonymous
  • anonymous
|dw:1440020159826:dw|
anonymous
  • anonymous
like that all vertical lines that bounce off the parabola will reflect into the focus
anonymous
  • anonymous
|dw:1440020223165:dw|
anonymous
  • anonymous
do you understand the focus now?
anonymous
  • anonymous
yes but is there an equation i cant use or something @dan915
anonymous
  • anonymous
well u are gonna solve for that
anonymous
  • anonymous
you need to know what a focus and directrix is to solve for it
anonymous
  • anonymous
|dw:1440020416431:dw|
anonymous
  • anonymous
the vertex has to be at 0,0 because it has to be in the middle of the directrix and the focus now you need some more points so you can solve for the whole parabola equation
anonymous
  • anonymous
|dw:1440020622812:dw|
anonymous
  • anonymous
|dw:1440020708157:dw|
anonymous
  • anonymous
wait im confused? @dan915
campbell_st
  • campbell_st
here is an easy method that uses the focal length and the standard form in this case of \[4a(x - h) = (y - k)^2\] (h, k) is the focus and a is the focal length|dw:1440022451273:dw|

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