Precalculus : Functions

Study concepts, example questions & explanations for Precalculus

varsity tutors app store varsity tutors android store

Example Questions

Example Question #1 : Find The Inverse Of A Relation

What is the inverse function of

 ?

Possible Answers:

Correct answer:

Explanation:

To find the inverse function of

we replace the  with  and vice versa.

So

Now solve for 

Example Question #2 : Inverse Functions

Find the inverse of the function.

 

Possible Answers:

Correct answer:

Explanation:

To find the inverse function, first replace  with :

Now replace each  with an  and each  with a :

Solve the above equation for :

Replace  with . This is the inverse function:

 

 

Example Question #3 : Inverse Functions

Find the inverse of the function.

 

Possible Answers:

Correct answer:

Explanation:

To find the inverse function, first replace  with :

Now replace each  with an  and each  with a :

Solve the above equation for :

Replace  with . This is the inverse function:

Example Question #4 : Inverse Functions

Find the inverse of the function .

Possible Answers:

Correct answer:

Explanation:

To find the inverse of , interchange the  and  terms and solve for .

Example Question #5 : Inverse Functions

What point is the inverse of the ?

Possible Answers:

Correct answer:

Explanation:

When trying to find the inverse of a point, switch the x and y values.

So  

Example Question #6 : Inverse Functions

What is the inverse of ?

Possible Answers:

Correct answer:

Explanation:

When trying to find the inverse of a point, switch the x and y values.

So, 

 

Example Question #1 : Inverse Functions

Find the inverse of the following function:

 

Possible Answers:

Correct answer:

Explanation:

In order to find the inverse of the function, we need to switch the x- and y-variables.

After switching the variables, we have the following:

Now solve for the y-variable. Start by subtracting 10 from both sides of the equation.

Divide both sides of the equation by 4.

Rearrange and solve.

Example Question #1 : Find The Inverse Of A Function

Find the inverse of,

 .

Possible Answers:

Correct answer:

Explanation:

In order to find the inverse, switch the x and y variables in the function then solve for y.

Switching variables we get,

 .

 Then solving for y to get our final answer.

Example Question #2 : Find The Inverse Of A Function

Find the inverse of,

.

Possible Answers:

Correct answer:

Explanation:

First, switch the variables making  into .

Then solve for y by taking the square root of both sides.

 

Example Question #1 : Linear Algebra

Find the inverse of the following equation.

.

Possible Answers:

Correct answer:

Explanation:

To find the inverse in this case, we need to switch our x and y variables and then solve for y.

Therefore,

 becomes,

To solve for y we square both sides to get rid of the sqaure root.

We then subtract 2 from both sides and take the exponenetial of each side, leaving us with the final answer.

 

Learning Tools by Varsity Tutors