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Math Help - Algerbra help

  1. #1
    Newbie
    Joined
    Jan 2008
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    Algerbra help

    I have a few different math problems i need help with
    1. Find the domain of the function 6(square sign)x (square sign end)-12
    2. Let f(x)= 18 calculate the following values
    f(a+h)
    f(a+h)-f(a) Over h

    So how would you do those?
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  2. #2
    Senior Member
    Joined
    Dec 2007
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    Melbourne
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    1. Find the domain of the function 6(square sign)x (square sign end)-12
    I think you mean 6 \sqrt{x} -12

    The domain is the set of possible values for x. \sqrt{x} doesn't work for negative numbers so the domain is [0,\infty)

    2. Let f(x)= 18 calculate the following values
    f(a+h)
    f(a+h)-f(a) Over h
    f(x) = 18.
    To find f(a+h) we replace all the xs with a+h.
    so f(a+h) = 18
    the same process gives us f(a) = 18, so \frac {f (a+h)-f (a)}{h} = 0
    Last edited by badgerigar; January 31st 2008 at 06:14 PM. Reason: fixed infinity sign
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