Finding intersection between exponential and inverse function

In summary, the graphs of f(x)=a^x and f^(-1)(x) intersect when the value of a is greater than 1. To have text and LaTeX on the same line, use [ itex ] and [ /itex ] tags.
  • #1
anonymous12
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Homework Statement



Given the exponential function and its inverse, where a > 0
Exponential Function:
[tex]f(x)=a^x[/tex]
Inverse function:
[tex]f^{-1}(x)=log_ax[/tex]

a) For what values of a do the graphs of f(x)=a^x and f^(-1)(x) intersect?

The Attempt at a Solution


I have no idea how to start this question.

Off topic: How do I make is so I can type a sentence and LaTeX on the same line?
 
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  • #2
anonymous12 said:

Homework Statement



Given the exponential function and its inverse, where a > 0
Exponential Function:
[tex]f(x)=a^x[/tex]
Inverse function:
[tex]f^{-1}(x)=log_ax[/tex]

a) For what values of a do the graphs of f(x)=a^x and f^(-1)(x) intersect?





The Attempt at a Solution


I have no idea how to start this question.

Off topic: How do I make is so I can type a sentence and LaTeX on the same line?

The graphs of y = f(x) and y = f-1(x) are reflections of each other across the line y = x. Think about what the graphs of your two functions look like, especially in relation to the line y = x.

You can have text and LaTeX on the same line if you use [ itex ] and [ /itex ] tags (no spaces).
 

1. What is an exponential function?

An exponential function is a mathematical function in the form of f(x) = ab^x, where a is the initial value and b is the growth factor. It is characterized by a rapid increase or decrease in value as the input variable, x, increases.

2. What is an inverse function?

An inverse function is a function that "undoes" the action of another function. In other words, if f(x) is a function, its inverse function, denoted as f^-1(x), will return the original input value, x, when plugged into the function f(x).

3. How do you find the intersection between an exponential and inverse function?

To find the intersection between an exponential and inverse function, set the two functions equal to each other and solve for the variable. This will give you the x-value of the intersection point. To find the y-value, plug the x-value into either of the original functions.

4. Can an exponential function and an inverse function intersect at more than one point?

Yes, it is possible for an exponential function and an inverse function to intersect at more than one point. This can occur when the two functions have different initial values or growth factors.

5. How can finding the intersection between an exponential and inverse function be useful?

Finding the intersection between an exponential and inverse function can be useful in a variety of fields, such as finance, biology, and physics. It can help in solving real-world problems involving growth or decay, optimization, and finding equilibrium points.

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