marigirl
  • marigirl
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!!
Mathematics
katieb
  • katieb
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freckles
  • freckles
so the cubic goes through (30,12)? if so replace y with 12 and x with 30 and solve for k
freckles
  • freckles
or is that what you did?
freckles
  • freckles
Try solving one more time...you should be getting a different k value

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marigirl
  • marigirl
omg i cant subtract
marigirl
  • marigirl
lol
freckles
  • freckles
so you got it now? it is easy to screw up the arithmetic :p
marigirl
  • marigirl
Yes thanks!

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