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anonymous
 one year ago
A parabola has its vertex at the origin and a directrix at y=4. Where is the focus located?
anonymous
 one year ago
A parabola has its vertex at the origin and a directrix at y=4. Where is the focus located?

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jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0blank xy axis dw:1437436785171:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0dw:1437436834898:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0draw in the directrix y = 4 dw:1437436852839:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0`A parabola has its vertex at the origin` dw:1437436941427:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0how far is the vertex from the directrix?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@jim_thompson5910 4 spaces

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0we move 4 spaces in the opposite direction to get to the focus dw:1437437123551:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0The focus is always located on the axis of symmetry. The axis of symmetry is the line perpendicular to the directrix and it passes through the vertex In this case, the axis of symmetry lies on top of the y axis dw:1437437233976:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ohhh I understand now! Thank you! So my focus is located at (0,4)
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