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Math Help - inverse of function

  1. #1
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    inverse of function

    if f(x)=Sqroot(x-4) , does it have an inverse for x>2 even though the function is undefined for (2,4)

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  2. #2
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    Quote Originally Posted by chrizzle View Post
    if f(x)=Sqroot(x-4) , does it have an inverse for x>2 even though the function is undefined for (2,4)

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    y= \sqrt{x-4} has x \in [4,\infty) and y \in [0,\infty)

    Therefore

    y^{-1}= x^2+4 has x \in [0,\infty) and y \in [4,\infty)
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