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checkitagain
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[itex] f(x) \ = \ \dfrac{1 - \sqrt{x}}{1 + \sqrt{x}}[/itex][itex]Edit: \ \ I \ sent \ a \ PM \ to \ a \ mentor.[/itex]
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[tex] \text{And what about any possible restrictions on a domain?}[/tex]mathman said:Finding √x is trivial.
[tex]\text{I don't know what you mean by/from particulars that you didn't type.}[/tex]
Just square it afterward.
DivisionByZro said:Thanks for posting this. I didn't see the challenge here though, it's really elementary algebra. The inverse of f(x) is:
[tex]
f^{-1}(x) = \frac{(1-x)^{2}}{(1+x)^{2}}
[/tex]
If you'd like to see my work, then just ask. It's easy to show that f(f^1(x)) = x.
checkitagain said:Hint: What you have typed is not a one-to-one function.
DivisionByZro said:What you posted was not one-to-one either.
If I restrict x>=0, then my inverse is correct. So I would say for x>=0, f^-1 is
[tex]
f^{-1}(x) = \frac{(1-x)^{2}}{(1+x)^{2}}
[/tex]
checkitagain said:Mine (meaning the original function) is one-to-one.
Recommendation:
Graph/sketch my function and see.
DivisionByZro said:Yeah I had made a slight typo, I looked at the graph of a completely different function. My answer stands,
[tex]
f^{-1}(x) = \frac{(1-x)^{2}}{(1+x)^{2}}
[/tex]
on x>=0 only.
An inverse function is a mathematical operation that reverses the effect of another function. In other words, if you apply a function to a number and then apply its inverse to the result, you will get back the original number.
To find the inverse function, you can use the process of algebraic manipulation. Start by switching the positions of the input variable (usually x) and the output variable (usually y). Then, solve for y in terms of x. The resulting equation will be the inverse function.
No, not all functions have an inverse. For a function to be invertible, it must pass the horizontal line test, meaning that every horizontal line intersects the graph of the function at most once. If a function fails this test, it does not have an inverse.
No, a function can only have one unique inverse. If a function has more than one inverse, it is not considered a function.
Inverse functions are commonly used in engineering, physics, and other scientific fields to model and solve problems. They can also be applied in areas such as finance, computer science, and statistics. For example, inverse functions are used in financial models to calculate compound interest rates, and in computer science to encrypt and decrypt data.