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    matdgob's Avatar
    matdgob Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 6, 2008, 10:13 PM
    domain of a composite function
    f(x) = 7x + 49; g(x) = x + 3
    Stringer's Avatar
    Stringer Posts: 3,733, Reputation: 770
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    #2

    Dec 7, 2008, 12:52 AM

    Wow, like in the Wizard of Oz, that dropped on me and my toes curled up...

    Stringer
    Elisha Grey's Avatar
    Elisha Grey Posts: 31, Reputation: 0
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    #3

    Dec 8, 2008, 02:55 PM

    This is not a composite function. If you are asking about
    f(g(x)) = 7g(x) + 49 = 7(x + 3) + 49 = 7x + 70 or
    g(f(x)) = f(x) + 3 = (7x + 49) + 3 = 7x + 52,
    in either case the domain is the entire real numbers--this is the equation of a straight line.
    Stringer's Avatar
    Stringer Posts: 3,733, Reputation: 770
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    #4

    Dec 8, 2008, 03:09 PM

    Mag, this new girl needs help with algebra concepts, Itold her you were an expert...

    Hi there
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