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Math Help - f(x) function equations

  1. #1
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    Question f(x) function equations

    Hi! I'm pretty sure I know how to do the basics of these equations, but this one really tripped me up. Can anyone show me how to do it?

    f(x) = 2x - x - 4x + 5

    I need to find f(-x).

    Any help would be really appreciated!
    Last edited by kalter; September 29th 2009 at 04:16 PM.
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  2. #2
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    wherever you see an x, replace it with a -x, simplify and you are done
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  3. #3
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    I know I have to replace it. but I can't seem to simplify it and none of it looks right

    I got f(x) = -2x + x + 4x + 5

    is that right? and if it isn't, can you perhaps explain it a little further?

    thanks!
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  4. #4
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     f(x) = 2x^3-x^2-4x+5

     f(-x) = 2(-x)^3-(-x)^2-4(-x)+5

     f(-x) = -2x^3-x^2+4x+5
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