anonymous
  • anonymous
Find the standard form of the equation of the parabola with a vertex at the origin and a focus at (0, -7). @astrophysics
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
this one is harder because it only gives u the focus
Astrophysics
  • Astrophysics
|dw:1435909082458:dw| not really, it's sort of similar to your other one
Astrophysics
  • Astrophysics
Can you figure out the directrix, remember how I said vertex is in the middle of directrix and focus, so your directrix will be?

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anonymous
  • anonymous
so it would be 7?
anonymous
  • anonymous
@Astrophysics or (0,7)?
Astrophysics
  • Astrophysics
Yes, good! |dw:1435909595769:dw| see how it's similar now to your previous question?
Astrophysics
  • Astrophysics
So what way will the parabola go?
anonymous
  • anonymous
you said it cant pass the directrix right?
Astrophysics
  • Astrophysics
Yup!
anonymous
  • anonymous
so it will go down?
anonymous
  • anonymous
sorry im bad with determining which way the parabola goes
Astrophysics
  • Astrophysics
|dw:1435910277561:dw| same as previous actually, remember it cannot pass the directrix
Astrophysics
  • Astrophysics
\[y = \frac{ 1 }{ 4p }(x-h)^2+k\] similar as previous question except now we have -7 as our p
anonymous
  • anonymous
so i was right when i said down, haha im getting better atleast
Astrophysics
  • Astrophysics
Yes you are :)
anonymous
  • anonymous
y = -1/7x^2 y2 = -7x y =-1/28x^2 y2 = -28x
anonymous
  • anonymous
y=-1/28x^2?
Astrophysics
  • Astrophysics
Yeah, that sounds good
anonymous
  • anonymous
thank you!
Astrophysics
  • Astrophysics
Np, also notice the negative represents the vertical reflection, meaning the parabola will open down :), just a hint on the way to draw it if you get stuck :P

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