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Math Help - inverse problems

  1. #1
    Junior Member
    Joined
    Sep 2009
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    40

    inverse problems

    I have a bunch of problems like this. I have no idea how to do it.
    Could someone guide me with just one problem:

    If f is one-to-one and f(-3)=13, then
    f^-1(13)=? and (f(-3))^-1=?
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  2. #2
    Junior Member
    Joined
    Nov 2008
    Posts
    55
    when it comes to functions, f^-1(x) means find y in f(y) = x. so in your example f^-1(13) = -3 since f(-3) = 13.
    when it comes to numbers, x^-1 = 1/x. so (f(-3))^-1 = 13^-1 (since f(-3) = 13) = 1/13.
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