anonymous
  • anonymous
what is the focus of the parabola given by -1/4(y+2)^2=(x-1)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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hartnn
  • hartnn
focus of parabola with the equation \((y+h)^2 = a(x-b)+k \) is \((a+h,k)\) now compare your equation with this standard equation and find a,h,k
anonymous
  • anonymous
there is no a or k in this equation
hartnn
  • hartnn
we need to compare equations! first multiply both sides by -4

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hartnn
  • hartnn
|dw:1439137783807:dw|
anonymous
  • anonymous
I don't get it
hartnn
  • hartnn
|dw:1439138094438:dw|
anonymous
  • anonymous
(4+2,0)
anonymous
  • anonymous
so (6,0)?
hartnn
  • hartnn
h= +2, a =-4
anonymous
  • anonymous
that isn't one of my options
hartnn
  • hartnn
h+a = 2-4 = -2 (-2, 0) is not in the options?
anonymous
  • anonymous
well kind of, it's in reverse though, (0,-2)
anonymous
  • anonymous
Does it make a difference?
hartnn
  • hartnn
then i might have my formula wrong.. (k, a+h) but yes, the focus is indeed (0,-2) verified from : http://www.wolframalpha.com/input/?i=focus+of+-1%2F4%28y%2B2%29%5E2%3D%28x-1%29+
anonymous
  • anonymous
okay thank you for your help
hartnn
  • hartnn
welcome ^_^

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