anonymous
  • anonymous
write the equation of the parabola with focus (1, -3) and vertex (5, -3)??
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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amistre64
  • amistre64
it opens to the left
amistre64
  • amistre64
the a value = 4 y^2 =16x modify for off centered
anonymous
  • anonymous
alright thanks, but how did you know that

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More answers

amistre64
  • amistre64
opps; opens left
amistre64
  • amistre64
the line between the vertex and foci is straight along the y = -3 axis
amistre64
  • amistre64
the vertex is the bend and the focus is inside the curve
amistre64
  • amistre64
the distance from the vertex to the focus is the "a" value in the parabola formula from geometery
amistre64
  • amistre64
y^2 = -4ax
anonymous
  • anonymous
is that the directrix?
amistre64
  • amistre64
the directix is on the other side of the vertex; the distance 'a'
amistre64
  • amistre64
the directix would be at x=9
anonymous
  • anonymous
ok
anonymous
  • anonymous
thank you
amistre64
  • amistre64
youre welcome :) the complete answer is: (y+3)^2 = -16(x-5)
anonymous
  • anonymous
lol thanks again :)
anonymous
  • anonymous
do you know what the latus rectum of a ellipse is?
amistre64
  • amistre64
sounds painful; .... i prolly do, but just dont know the proper term for it :)
anonymous
  • anonymous
haha i was out of school and i come back i was like wtf???
amistre64
  • amistre64
it is defined as the chord running thru the focus
anonymous
  • anonymous
mhmm
anonymous
  • anonymous
amistre64 come back to mine please
amistre64
  • amistre64
(y+3)^2 = -16(x-5) plug in x = 1 -16(-4) = y^2 + 9 + 6y = -64 y^2 +6x +73 = 0
amistre64
  • amistre64
6x shoulda been 6y
amistre64
  • amistre64
the latus rectum is the line thru the foci and those y values
anonymous
  • anonymous
but thats a parabola right? the ellipse's equation is (x-3)^2/16 + (y+6)^2/4 = 1
amistre64
  • amistre64
i forgot how to multiply lol
amistre64
  • amistre64
http://www.google.com/search?q=latus+rectum+ellipse&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&hl=en&tab=wi&biw=1024&bih=622
amistre64
  • amistre64
same concept; its the line thru the focus that runs perp to the center line
anonymous
  • anonymous
oh ok well, thank you
amistre64
  • amistre64
we got about a min b4 they shut the site down for maintainence
anonymous
  • anonymous
dang

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