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Thread: Equation that is its own inverse

  1. March 9th 2009, 07:39 AM #1
    i_cow044
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    Equation that is its own inverse

    Why is Y = -X + B it's own inverse, I can illustrate this graphically but not algebraically. can any one help me with this??
    Thank you
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  2. March 9th 2009, 07:42 AM #2
    TheEmptySet
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    Quote Originally Posted by i_cow044 View Post
    Why is Y = -X + B it's own inverse, I can illustrate this graphically but not algebraically. can any one help me with this??
    Thank you
    functions are inverses if

    (f \circ f)(x)=x so lets try it

    (f \circ f)(x)=f(f(x))=-(-x+b)+b=x-b+b=x

    yay!!!
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