Find f(x)^-1 of y=4x+9/2x-3: Answer in Textbook

In summary, to find f(x)^-1 of y=4x+9/2x-3, the answer is f(x)^-1=3x+9/2x-4. To solve for the inverse, expand the equation and collect terms in x.
  • #1
Ry122
565
2
how do i find
f(x)^-1 of y=4x+9/2x-3
the answer in the back of the textbook is

f(x)^-1=3x+9/2x-4
 
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  • #2
Show your attempt at a solution, or pay me 1 dollar for doing your homework for you (your choice).
 
  • #3
2x=4x+9/y + 3y/y
2x=4x+9+3y/y
How do i move 4x to the other side?
 
  • #4
is 9/2x in your original post 9/(2x)? Just want to check.
 
  • #5
Heres the full working out:
y(2x-3)=4x+9
2x-3=4x+9/y
2x=4x+9/y + 3
2x=4x+9/y + 3y/y
 
  • #6
You got to learn to put brackets in your eqns. There's no way anyone could have understood your original problem without the brackets.

y(2x-3)=4x+9
x(2y-4)-3y=9
x=(9+3y)/(2y-4)
 
  • #7
Sorry to bother u again but how
do u get from
y(2x-3)=4x+9 to
x(2y-4)-3y=9
 
  • #8
expand and collect terms in x

y(2x-3)=4x+9
->
y2x-3y=4x+9
->
x(2y)-3y=x(4)+9
->
x(2y-4)-3y=9
 

1. What is the inverse of the function y=4x+9/2x-3?

The inverse of the function y=4x+9/2x-3 is f(x)^-1= (2x-3)/4x+9.

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

To find the inverse of a function, you must switch the x and y variables and solve for y. This will give you the inverse function, which can be denoted as f(x)^-1.

3. Is there a specific method for finding the inverse of a function?

Yes, there are specific methods for finding the inverse of a function depending on the type of function. For linear functions, you can use the switch-and-solve method. For other types of functions, you may need to use algebraic methods or graphing techniques.

4. How do you know if the inverse of a function exists?

The inverse of a function exists if the function is one-to-one, meaning that each input (x) corresponds to a unique output (y). This can be determined by graphing the function and checking if it passes the vertical line test.

5. Can the inverse of a function be expressed using the same equation as the original function?

No, the inverse of a function will have a different equation than the original function. However, the inverse function and the original function will have a special relationship where they "undo" each other when composed together. This means that f(f(x))=x and f(f(x)^-1)=x.

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