anonymous
  • anonymous
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
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
@Elsa213
freckles
  • freckles
|dw:1439322589152:dw|
freckles
  • freckles
the 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

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More answers

freckles
  • freckles
setup this equation
freckles
  • freckles
and play with eventually you should get the form mentioned in your choices
anonymous
  • anonymous
is c correct
anonymous
  • anonymous
@freckles
campbell_st
  • campbell_st
C can't be correct as the parabola is concave down... so the coefficient of x^2 is needs to be negative
freckles
  • freckles
did 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
  • anonymous
@campbell_st is it b
campbell_st
  • campbell_st
why guess.... learn a little... but this is what I'd do... |dw:1439322785572:dw|
campbell_st
  • campbell_st
the vertical dotted line is the line of symmetry
anonymous
  • anonymous
so d is correct thanks :)
anonymous
  • anonymous
@campbell_st
campbell_st
  • campbell_st
is it... I have no idea... I haven't calculated anything...
anonymous
  • anonymous
can you calucute then ? @campbell_st
freckles
  • freckles
@jammy987 did you not want to try to set the two distances I talked about equal to each other?
campbell_st
  • campbell_st
sure what is the vertical distance from the focus to the directrix...?
anonymous
  • anonymous
4 correct
anonymous
  • anonymous
and @freckles ikust need the answer sorry
campbell_st
  • campbell_st
no 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
  • freckles
ok you can count me out then have fun

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