Algebra II : Functions and Graphs

Study concepts, example questions & explanations for Algebra II

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Example Questions

Example Question #33 : Inverse Functions

Solve for the inverse:  

Possible Answers:

Correct answer:

Explanation:

Interchange the x and y-variables, and solve for y.

Subtract six from both sides.

Simplify the right side.

In order to isolate the y-variable, we will need to multiply six on both sides.

Simplify both sides.  Distribute the integer through the binomial on the left.

The answer is:  

Example Question #31 : Inverse Functions

Find the inverse of the function:  

Possible Answers:

Correct answer:

Explanation:

Interchange the x and y-variables.

Solve for y.  Subtract three from both sides.

Simplify the right side.

Divide by four on both sides.

Simplify both sides.

The answer is:  

Example Question #35 : Inverse Functions

Find the inverse of:  

Possible Answers:

Correct answer:

Explanation:

Interchange the x and y-variables.  The equation becomes:

Subtract five from both sides.

Take the cubed root on both sides.  This will eliminate the cubed exponent.

The answer is:  

Example Question #231 : Introduction To Functions

Determine the inverse of:  

Possible Answers:

Correct answer:

Explanation:

Interchange the x and y-variables.

Solve for y.  Add one-half on both sides.

Simplify both sides.

Multiply five over two on both sides in order to isolate the y-variable.

Apply the distributive property on the left side.  The right side will reduce to just a lone y-variable.

The answer is:  

Example Question #37 : Inverse Functions

Determine the inverse of:  

Possible Answers:

Correct answer:

Explanation:

Interchange the x and y-variables and solve for y.

Add one on both sides.

Divide by negative two on both sides.

Simplify the fractions.

The answer is:  

Example Question #36 : Inverse Functions

Determine the inverse:  

Possible Answers:

Correct answer:

Explanation:

In order to find the inverse of this function, interchange the x and y-variables.

Subtract three from both sides.

Simplify the equation.

Divide by ten on both sides.

Simplify both sides.

The answer is:  

Example Question #38 : Inverse Functions

Determine the inverse for the function:  

Possible Answers:

Correct answer:

Explanation:

To find the inverse function, swap the x and y-variables.

Solve for y.  Add 30 on both sides.

Simplify the right side.

Divide by negative two on both sides.'

Simplify both fractions.

The answer is:  

Example Question #231 : Functions And Graphs

Find the inverse function of the function  below:

Possible Answers:

Correct answer:

Explanation:

To determine the inverse function  of an explicitly defined function , substitute the dependent variable  and independent variable  for  and  respectively, and then solve the resultant equation for . This new equation will define the inverse function , provided that  and  for every  in the domain of .

For this particular function, let  denote the dependent variable :

.

Swap the variables  and :

.

Let us now solve this equation for . Multiplying both sides by  yields

.

Subtracting the term  and adding the term  to both sides yields

.

On the left-hand side of the equation, factor out  from both terms using the distributive property to yield

.

Now divide both sides of the equation by  to isolate the variable :

.

In order to communicate the idea that this equation defines the inverse function to , let  to yield the final answer:

.

To verify that this function is indeed the inverse of , calculate  and 

                     

                     

                      ,

 

                    

                    

                     .

Hence, the inverse function of the function  is

Example Question #41 : Inverse Functions

Determine the inverse of:  

Possible Answers:

Correct answer:

Explanation:

Interchange the x and y-variables and solve for y.

Distribute the nine through the binomial.

Add eighteen on both sides.

Divide by 54 on both sides.

The answer is:  

Example Question #42 : Inverse Functions

Determine the inverse of .

Possible Answers:

Correct answer:

Explanation:

Interchange the x and y-variables and solve for y.

Distribute the integer through the binomial.

Add  on both sides.

Subtract  on both sides.

Divide by four on both sides.

Simplify both sides.

The inverse is:  

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