if f(x)=Sqroot(x-4) , does it have an inverse for x>2 even though the function is undefined for (2,4) Cheers
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Originally Posted by chrizzle if f(x)=Sqroot(x-4) , does it have an inverse for x>2 even though the function is undefined for (2,4) Cheers $\displaystyle y= \sqrt{x-4}$ has $\displaystyle x \in [4,\infty)$ and $\displaystyle y \in [0,\infty)$ Therefore $\displaystyle y^{-1}= x^2+4$ has $\displaystyle x \in [0,\infty)$ and $\displaystyle y \in [4,\infty)$
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