IsTim
  • IsTim
Determine the exact equation of the function given: f(x)=k(x-1)(x+2) and goes thru point (2,-8)
Mathematics
katieb
  • katieb
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IsTim
  • IsTim
I'm looking through my notes, and it gives info SO close to what I want...
Directrix
  • Directrix
-8 =k(2-1)(2+2) -8 = k (1)(4) -8= 4k k=-2
IsTim
  • IsTim
So all I do was sub in values? Ok. Thank you.

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Directrix
  • Directrix
Yes. You may need to multiply out the factors and express the answer in polynomial form. Check the directions.
IsTim
  • IsTim
"Multiply out"? And what do you mean by polynomial form?
chris
  • chris
He's saying that polynormial form is http://en.wikipedia.org/wiki/Polynomial - e.g. ax^2 + bx + c - basically the opposite of factored. really depends on how they want the final format of the equation
chris
  • chris
e.g. if k = -2, then one way to write the equation is f(x) = -2(x-1)(x+2)
chris
  • chris
another way is to FOIL (x-1)(x+2) to put the final equation in polynomial form
IsTim
  • IsTim
Ok. Thank you Chris.
chris
  • chris
Basically it's up to convention - they are equivalent
chris
  • chris
np!

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