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marigirl

  • one year ago

I am trying to model a cubic graph: I want it to pass through the origin, x=60 and x=120. So far I have: y=kx(x-60)(x-120). i also want it to have a point (30,12). I tried to find a k value (1/4500) but it is not giving me the point i wanted?! help plz!!

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  1. freckles
    • one year ago
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    so the cubic goes through (30,12)? if so replace y with 12 and x with 30 and solve for k

  2. freckles
    • one year ago
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    or is that what you did?

  3. freckles
    • one year ago
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    Try solving one more time...you should be getting a different k value

  4. marigirl
    • one year ago
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    omg i cant subtract

  5. marigirl
    • one year ago
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    lol

  6. freckles
    • one year ago
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    so you got it now? it is easy to screw up the arithmetic :p

  7. marigirl
    • one year ago
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    Yes thanks!

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spraguer (Moderator)
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