Algebra II : Functions and Graphs

Study concepts, example questions & explanations for Algebra II

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Example Questions

Example Question #3 : Inverse Functions

  

What is  ?

Possible Answers:

Correct answer:

Explanation:

The question is essentially asking this: take  say that equals , then take , then whatever that equals, say , take . So, we start with ; we know that , so if we flip that around we know . Now we have to take , but we know that is . Now we have to take , but we don't have that in our table; we do have , though, and if we flip it around, we get , which is our answer. 

Example Question #4 : Inverse Functions

  

What is  ?

Possible Answers:

Correct answer:

Explanation:

Our question is asking "What is  of  of  inverse?" First we find the  inverse of . Looking at the question, we see ; if we flip that around, we get . Now we need to find what  is; that is an easy one, as it is directly provided: . Now we need to find . Again, this isn't given, but what is given is , so , and that is our answer. 

Example Question #5 : Inverse Functions

Over which line do you flip a function when finding its inverse?

Possible Answers:

You do not flip a function over a line when finding its inverse.

Correct answer:

Explanation:

To find the inverse of a function, you need to change all of the  values to  values and all the  values to  values. If you flip a function over the line , then you are changing all the  values to  values and all the  values to  values, giving you the inverse of your function. 

Example Question #6 : Inverse Functions

Find the inverse of this function: 

Possible Answers:

Correct answer:

Explanation:

To find the inverse of a function, we need to switch all the inputs ( variables) for all the outputs ( variables or  variables), so if we just switch all the  variables to  variables and all the  variables to  variables and solve for , then  will be our inverse function. 

turns into the following once the variables are switched:

the first thing we do is subtract  from each side; then, we take the natural log of each side. This gives us

Then we just add three to each side and take the square root of each side, making sure we have both the positive and negative roots. 

This is the inverse function of the function with which we were provided.

Example Question #1 : Inverse Functions

Please find the inverse of the following function.

Possible Answers:

Correct answer:

Explanation:

In order to find the inverse function, we must swap  and  and then solve for .

Becomes

Now we need to solve for :

Finally, we need to divide each side by 4.

This gives us our inverse function:

Example Question #1 : Inverse Functions

Find the inverse of .

Possible Answers:

Correct answer:

Explanation:

To create the inverse, switch x and y making the solution   x=3y+3. 

y must be isolated to finish the problem.

Example Question #1 : Inverse Functions

 

Which one of the following functions represents the inverse of 

A) 

B) 

C) 

D) 

E) 

Possible Answers:

E)

B)

C)

A)

D)

Correct answer:

C)

Explanation:

Given

Hence 

Interchanging  with  we get:

Solving for  results in .

Example Question #1 : Inverse Functions

What is the inverse of ?

Possible Answers:

Correct answer:

Explanation:

Interchange the  and  variables and solve for .

Example Question #11 : Inverse Functions

Inverse Functions

Given the function  below, find its inverse: 

Possible Answers:

Correct answer:

Explanation:

When finding the inverse go through the following steps: 

1) Replace f(x) with y: 

2) Swap the x and y variables

3) Solve for y: 

  add 5 to both sides

  divide everything by 3

 

  simplify and express as an inverse using 

 

 

Example Question #201 : Functions And Graphs

Find the inverse of .

Possible Answers:

Correct answer:

Explanation:

To find the inverse of a function, swap the x and y variable and solve for y.

The new expression after the swap is 

Now solve for y.

This y actually represents the inverse of the original y.

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