anonymous
  • anonymous
If the telescope is 1 m deep and 8 m wide, how far is the focus from the vertex?
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
welshfella
  • welshfella
the telescope is a parabola use the standard form x^2 = 4ay where (0.a) is the focus here x^2 = 8x so what is the value of a?
welshfella
  • welshfella
* x^2 = 8y

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anonymous
  • anonymous
?
anonymous
  • anonymous
welshfella
  • welshfella
x^2 = 4ay x^2 = 8y therfore 4a = 8 and a = 2 the focus is 2 m from the vertex
welshfella
  • welshfella
do you follow that?
anonymous
  • anonymous
yes
welshfella
  • welshfella
good
welshfella
  • welshfella
be lucky!

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