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Math Help - Evaluating Functions

  1. #1
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    Evaluating Functions

    Can someone confirm whether or not I came up with right answers for these?

    1. f(y) = 5y - 3 ; f(2.4)
    My answer: f(y) = 9

    2. g(m) = 2m^2 - 18 / m^2 ; g(0)
    My answer: undefined

    3. h(q) =
    q^2 + 20, q </= - 6
    4q^2 + 20, q > -6
    ; h(-6)
    My answer: h(q) = 56

    4. g(s) =
    s, s </= -1
    s^2 + s, -1 < s </= 1
    s^3 + s^2, s > 1
    ; g(-4/5)
    My answer: g(s) = -4/25

    Last one is obviously wrong, but I'm trying to figure out just what I did wrong. Any help would be appreciated.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by wrongnmbr View Post
    Can someone confirm whether or not I came up with right answers for these?

    1. f(y) = 5y - 3 ; f(2.4)
    My answer: f(y) = 9

    2. g(m) = 2m^2 - 18 / m^2 ; g(0)
    My answer: undefined

    3. h(q) =
    q^2 + 20, q </= - 6
    4q^2 + 20, q > -6
    ; h(-6)
    My answer: h(q) = 56

    4. g(s) =
    s, s </= -1
    s^2 + s, -1 < s </= 1
    s^3 + s^2, s > 1
    ; g(-4/5)
    My answer: g(s) = -4/25

    Last one is obviously wrong, but I'm trying to figure out just what I did wrong. Any help would be appreciated.
    why do you say the last one is wrong?
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  3. #3
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    I wasn't expecting to come up with a fraction. I'm also not sure if I squared it correctly.
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by wrongnmbr View Post
    I wasn't expecting to come up with a fraction. I'm also not sure if I squared it correctly.
    you have the right answers
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  5. #5
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    Hmm, is there a way to check?
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  6. #6
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    Quote Originally Posted by wrongnmbr View Post
    Hmm, is there a way to check?
    have a graphing calculator?

    or, you can use this ...

    http://wims.linex.org/wims.cgi?lang=...%2Ffunction.en
    Last edited by skeeter; August 22nd 2010 at 01:21 PM.
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