Finding the inverse of a function

In summary: I'm sorry, I cannot answer that as I am a machine learning model and do not have access to the original problem. Please provide more context for me to give a summary.
  • #1
anubis01
149
1

Homework Statement


1)Find the inverse of a f(x)=1+e^x/1-e^x

2)solve for x when e^ax=ce^bx where a doesn't equal b.


Homework Equations


1)ln(e^x)=x

2)ln(e^x)=x


The Attempt at a Solution


1)
(1+e^x/1-e^x)(1+e^x/1+e^x)=(2+e^x^2/2)
ln(2+e^x^2/2)= ln2+x^2/ln2

sqrt(ln2/ln2)=x

I think this is what x comes out to but I'm not sure.

2)
ln(e^ax)=ln(ce^bx)
ax=bxC
a-b=x-x

Again I'm not sure if this is right, any help is much appreciated.
 
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  • #2
I'm thrown off by the division by 1.
i.e. e^x/1 = e^x?
 
  • #3
anubis01 said:

Homework Statement


1)Find the inverse of a f(x)=1+e^x/1-e^x

2)solve for x when e^ax=ce^bx where a doesn't equal b.


Homework Equations


1)ln(e^x)=x

2)ln(e^x)=x

You realize those are the same equation, don't you?:smile:


The Attempt at a Solution


1)
(1+e^x/1-e^x)(1+e^x/1+e^x)=(2+e^x^2/2)
No, that's just bad algebra. [(1+e^x)(1+e^x)= 1+ 2ex+ e2x is the numerator and the denominator is 1- e2x, not "2".0

ln(2+e^x^2/2)= ln2+x^2/ln2
And even if it were correct, ln(A+ B) is not ln(A)+ ln(B).

sqrt(ln2/ln2)=x

I think this is what x comes out to but I'm not sure.
No, it doesn't. The if y= f(x), then x= f-1 of y so the standard way to find the inverse of y= f(x) is to solve the equation for x. If y= (1+ex)/(1- ex) then (1- ex)y= 1+ ex or y- yex= 1+ ex. y(1+ ex)= y- 1, 1+ ex= (y- 1)/y, ex= (y-1)/y- 1= (y-1)/y- y/y= -1/y. Can you solve that for x?

2)
ln(e^ax)=ln(ce^bx)
ax=bxC
No, ln(AB) is not A ln(B) ln(ce^(bx))= ln(c)+ ln(bx)= ln(c)+ bx.
a-b=x-x

Again I'm not sure if this is right, any help is much appreciated.
Since the "x"s cancel out in what you have, you should be sure it is not right!
 
  • #4
1) IF e^x=-1/y then ln(e^x)=ln(-1/y)
x=ln(-1/y)
y=ln(-1/x)
 
  • #5
is the answer to the problem y= ln(x/2) ?
 

1. What is the inverse of a function?

The inverse of a function is a new function that reverses the input and output values of the original function. In other words, the input of the original function becomes the output of the inverse function, and vice versa.

2. How do you find the inverse of a function?

To find the inverse of a function, switch the x and y variables and solve for y. This will give you the equation of the inverse function. Keep in mind that not all functions have an inverse, and some may have more than one inverse.

3. What is the notation for the inverse of a function?

The notation for the inverse of a function is f-1(x), where f(x) is the original function. This notation is read as "f inverse of x".

4. Are there any restrictions for finding the inverse of a function?

Yes, there are certain restrictions for finding the inverse of a function. The original function must be a one-to-one function, meaning that each input has a unique output. Additionally, the function must pass the horizontal line test, which means that no horizontal line can intersect the graph of the function more than once.

5. How do you graph the inverse of a function?

To graph the inverse of a function, switch the x and y coordinates of each point on the original function's graph. This will give you the graph of the inverse function. Keep in mind that the inverse function will be a reflection of the original function over the line y = x.

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