anonymous
  • anonymous
I need help on a precalc question, medal and fan: Find an equation in standard form for the ellipse with the vertical major axis of length 18, and minor axis of length 6. Please just walk me through it so I know how to do it.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
@ganeshie8 can you get someone on here to help me?
anonymous
  • anonymous
@thomaster
anonymous
  • anonymous
@phi

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anonymous
  • anonymous
please dude
phi
  • phi
do you know the generic equation for an ellipse?
anonymous
  • anonymous
x^2/a^2 + y^2/b^2 = 1
phi
  • phi
ok, and generally the a is the semi major-diameter (1/2 of the longer diameter) if the y direction is longer, you put the a^2 underneath the y
anonymous
  • anonymous
ok so now what values do I have to plug in?
phi
  • phi
vertical major axis of length 18, that is telling you the y direction is the major axis the 18 is the entire height of the ellipse. you want 1/2 of that for "a"
phi
  • phi
minor axis of length 6 that is the width of the ellipse. you want 1/2 of that for b
anonymous
  • anonymous
so 9^2 =81 y^2/81 + x^2/b^2 = 1
phi
  • phi
so far, so good
anonymous
  • anonymous
so now what about b?
phi
  • phi
I posted about "b" up above.
anonymous
  • anonymous
oh lol sorry, so 3^2 = 9 y^2/81 + x^2/9 = 1?
phi
  • phi
yes
anonymous
  • anonymous
can you help with another?
anonymous
  • anonymous
@ phi ? Find all polar coordinates of point P where P = (5,-pi/6)

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