Maddy1251
  • Maddy1251
Write the equation of the parabola below: Directrix: x=3/4 Focus at : (5/4, -3)
Mathematics
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SOLVED
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katieb
  • katieb
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Maddy1251
  • Maddy1251
@superdavesuper ? Help? ;/
superdavesuper
  • superdavesuper
hi @Maddy1251 :) oh i know tis one lol look at the plot here: http://www.mathwords.com/d/directrix_parabola.htm note the vertex...where is it in ur plot?
Maddy1251
  • Maddy1251
@superdavesuper the vertex of that parabola is (3,-2)

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Maddy1251
  • Maddy1251
I don't know where it is at in my plot :P
superdavesuper
  • superdavesuper
good good now check out the eqn for parabola here: http://www.mathwords.com/p/parabola.htm w vertex at (h,k)....
Maddy1251
  • Maddy1251
@superdavesuper thats the same graph as before, but, Is it saying that the focus is the same distance away from the vertex just like the directrix is the same difference from the vertex?
Maddy1251
  • Maddy1251
Which would then be (1,-3)?
superdavesuper
  • superdavesuper
correct - the vertex is at the mid-pt between focus n directix :)
Maddy1251
  • Maddy1251
Okay :) and the parabola I have listed is a horizontal one. @superdavesuper
superdavesuper
  • superdavesuper
@Maddy1251 oh u are right....well just flip x n y in the vertix form then :)
Maddy1251
  • Maddy1251
I did! I think I got it thank you so much :)
superdavesuper
  • superdavesuper
welcome :)

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