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anonymous
 one year ago
Derive the equation of the parabola with a focus at (−2, 4) and a directrix of y = 6. Put the equation in standard form.
f(x) = one fourthx2 − x + 4
f(x) = −one fourthx2 − x + 4
f(x) = one fourthx2 − x + 5
f(x) = −one fourthx2 − x + 5
anonymous
 one year ago
Derive the equation of the parabola with a focus at (−2, 4) and a directrix of y = 6. Put the equation in standard form. f(x) = one fourthx2 − x + 4 f(x) = −one fourthx2 − x + 4 f(x) = one fourthx2 − x + 5 f(x) = −one fourthx2 − x + 5

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freckles
 one year ago
Best ResponseYou've already chosen the best response.2dw:1439322589152:dw

freckles
 one year ago
Best ResponseYou've already chosen the best response.2the distance from the point (x,y) to the focus is suppose to be equal to the distance from the point (x,y) to the directrix

freckles
 one year ago
Best ResponseYou've already chosen the best response.2and play with eventually you should get the form mentioned in your choices

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.1C can't be correct as the parabola is concave down... so the coefficient of x^2 is needs to be negative

freckles
 one year ago
Best ResponseYou've already chosen the best response.2did you try setting up the equation? I'm not sure why they ask you to derive it when it is multiple choice because you don't really need to derive the formula if is multiple choice odd but yep the way I mentioned is to derive the equation set the two distances I talked about equal to each other

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@campbell_st is it b

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.1why guess.... learn a little... but this is what I'd do... dw:1439322785572:dw

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.1the vertical dotted line is the line of symmetry

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so d is correct thanks :)

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.1is it... I have no idea... I haven't calculated anything...

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0can you calucute then ? @campbell_st

freckles
 one year ago
Best ResponseYou've already chosen the best response.2@jammy987 did you not want to try to set the two distances I talked about equal to each other?

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.1sure what is the vertical distance from the focus to the directrix...?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0and @freckles ikust need the answer sorry

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.1no have a look again... the focus has a y value of y = 4 the directrix is at y = 6 how far apart are the y values...?

freckles
 one year ago
Best ResponseYou've already chosen the best response.2ok you can count me out then have fun
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