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IsTim

  • 4 years ago

Determine the exact equation of the function given: f(x)=k(x-1)(x+2) and goes thru point (2,-8)

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  1. IsTim
    • 4 years ago
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    I'm looking through my notes, and it gives info SO close to what I want...

  2. Directrix
    • 4 years ago
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    -8 =k(2-1)(2+2) -8 = k (1)(4) -8= 4k k=-2

  3. IsTim
    • 4 years ago
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    So all I do was sub in values? Ok. Thank you.

  4. Directrix
    • 4 years ago
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    Yes. You may need to multiply out the factors and express the answer in polynomial form. Check the directions.

  5. IsTim
    • 4 years ago
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    "Multiply out"? And what do you mean by polynomial form?

  6. Chris
    • 4 years ago
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    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

  7. Chris
    • 4 years ago
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    e.g. if k = -2, then one way to write the equation is f(x) = -2(x-1)(x+2)

  8. Chris
    • 4 years ago
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    another way is to FOIL (x-1)(x+2) to put the final equation in polynomial form

  9. IsTim
    • 4 years ago
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    Ok. Thank you Chris.

  10. Chris
    • 4 years ago
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    Basically it's up to convention - they are equivalent

  11. Chris
    • 4 years ago
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    np!

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