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Math Help - function composition

  1. #1
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    function composition

    i am utterly confused about this.

    question says: find two functions f and g so that h(x)=2(x-9)^3-(x-9)^2+4

    i dont know the first step id take to go about this problem, any help would be appreciated. this was a question on my test and i got it wrong, and it was a full 6pt deduction.

    thanks!
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  2. #2
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    Re: function composition

    Quote Originally Posted by noork85 View Post
    i am utterly confused about this.

    question says: find two functions f and g so that h(x)=2(x-9)^3-(x-9)^2+4

    i dont know the first step id take to go about this problem, any help would be appreciated. this was a question on my test and i got it wrong, and it was a full 6pt deduction.

    thanks!
    you just need to notice one function "inside" another ...

    g(x) = x-9

    f(x) = 2x^3 - x^2 + 4

    h(x) = f[g(x)]
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  3. #3
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    Re: function composition

    ahh...i see. i failed to notice that it says "composition"

    thank u very much!
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