anonymous
  • anonymous
Identify the vertex, focus, and directrix of the parabola with the equation x^2 – 6x – 8y + 49 = 0
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
vertex (3,5)
anonymous
  • anonymous
we have formula to figure out the focus and directrix. temporarily cannot remember. let me check
anonymous
  • anonymous
yes. focus (3,10)

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anonymous
  • anonymous
how did you get that?
anonymous
  • anonymous
like can you show me step by step please because i have a bunch of other problems that are the same :)
anonymous
  • anonymous
to get vertex, you isolate y, take y', let y'=0 to get x, y of the vertex
anonymous
  • anonymous
to get focus, you have formula x^2 =4py, your x is (x-3) your y = y-5---> p =10
anonymous
  • anonymous
the directrix is y =-p = -10
anonymous
  • anonymous
I think so. check your answer book. long time , i may not be right.
anonymous
  • anonymous
thanks a lot :)
anonymous
  • anonymous
you 're welcome

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