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anonymous

  • one year ago

What is the equation of the following graph?

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    \[y^2=4px\]find out the p

  3. anonymous
    • one year ago
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    you can do that or do you need help?

  4. anonymous
    • one year ago
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    I need help, I don't understand /:

  5. anonymous
    • one year ago
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    1 way to find p is to use absolute value of the distance between the origin of your parabola and the directrix.

  6. anonymous
    • one year ago
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    |dw:1438925592999:dw|

  7. anonymous
    • one year ago
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    since we are finding positive p you have to multiple by -1

  8. anonymous
    • one year ago
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    but how to I find the correct absolute value?

  9. anonymous
    • one year ago
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    look at the graph

  10. anonymous
    • one year ago
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    when y=10 x=5 can't we make use of that @saseal ?

  11. anonymous
    • one year ago
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    @R05E you have to be sure if that is your focus

  12. anonymous
    • one year ago
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    the ------ line shows the directrix @saseal ?

  13. anonymous
    • one year ago
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    yea thats the directrix line

  14. anonymous
    • one year ago
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    then p=5 @saseal ?

  15. anonymous
    • one year ago
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    yes

  16. anonymous
    • one year ago
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    but if we put y=10 and x=5 we get p=1... why is that? :\

  17. anonymous
    • one year ago
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    |dw:1438927425580:dw|

  18. anonymous
    • one year ago
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    because directix=-p and focus is (p,0)

  19. anonymous
    • one year ago
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    it just happens in this question that y=10 x=5 at the focus, doesnt mean it will always happen

  20. anonymous
    • one year ago
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    So the equation of the parabola is y^2=20x or y^2=4x ? I'm confused... @saseal ...:(

  21. anonymous
    • one year ago
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    y^2=4(5)x -> y^2=20x

  22. anonymous
    • one year ago
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    but by plugging in the coordinates we cant make sure of the equation... why's that?

  23. anonymous
    • one year ago
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    theres always 2 answers to the parabola unless you are at origin. good luck pluggin em out

  24. anonymous
    • one year ago
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    sorry sorry I got that wrong thank you very very much by the way!!! @saseal... for your patience and kindness!! I love you!! I will medal you..!!!

  25. anonymous
    • one year ago
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    yw

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