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Precalculus : Inverse Functions

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Example Questions

Example Question #2 : Find The Inverse Of A Function

Find the inverse of the following function.

y=x^3+e^0

Possible Answers:

$y^{-1}=\sqrt[3]{x+e}$

$y^{-1}=\sqrt[{3}]{x-1}$

$y^{-1}=1-x^{3}}$

$y^{-1}=e^{0}}$

Correct answer:

$y^{-1}=\sqrt[{3}]{x-1}$

Explanation:

To find the inverse of y, or

$y^{-1}$

first switch your variables x and y in the equation.

$x_{i}=y_i^3+e^0$

Second, solve for the variable y_i in the resulting equation.

x_i-e^0=y_i^3

$(x_i-e^0)^\frac{1}{3}=(y_i^{3})^\frac{1}{3}$

$y_i=\sqrt[3]{x_i-e^0}$

Simplifying a number with 0 as the power, the inverse is

$y^{-1}=\sqrt[{3}]{x-1}$

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Example Question #5 : Find The Inverse Of A Function

Find the inverse of the following function.

$y=\ln\, x\: +\: \pi$

Possible Answers:

$y^{-1}=\ln(y)-\pi$

$y^{-1}=\pi-\ln(x)$

Does not exist

$y^{-1}=e^{x-\pi}$

Correct answer:

$y^{-1}=e^{x-\pi}$

Explanation:

To find the inverse of y, or

$y^{-1}$

first switch your variables x and y in the equation.

$x_i=\ln(y_i)+\pi$

Second, solve for the variable y_i in the resulting equation.

$x_i-\pi=\ln\,y_i$

And by setting each side of the equation as powers of base e,

$y^{-1}=e^{x-\pi}$

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Example Question #3 : Find The Inverse Of A Function

Find the inverse of the function.

y=x+5

Possible Answers:

$y^{-1}=-x-5$

$y^{-1}=x-5$

$y^{-1}=5-x$

$y^{-1}=5+x$

Correct answer:

$y^{-1}=x-5$

Explanation:

To find the inverse we need to switch the variables and then solve for y.

y=x+5

Switching the variables we get the following equation,

x=y+5 .

Now solve for y.

$y^{-1}=x-5$

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Example Question #4 : Find The Inverse Of A Function

Find the inverse of

y=10x+9

Possible Answers:

y=9x-10

y=10x

$y=\frac{x-9}{10}$

$y=\frac{9x}{10}$

y=9x+10

Correct answer:

$y=\frac{x-9}{10}$

Explanation:

So we first replace every with an and every with a .

Our resulting equation is:

x=10y+9

Now we simply solve for y.

Subtract 9 from both sides:

x-9=10y+9-9

x-9=10y

Now divide both sides by 10:

$\frac{x-9}{10}=\frac{10y}{10}$

$\frac{x-9}{10}=y$

The inverse of

y=10x+9

$y=\frac{x-9}{10}$

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Example Question #3 : Find The Inverse Of A Function

What is the inverse of

y=9x

Possible Answers:

x=0

y=0

y=x

$y=\frac{x}{9}$

y=9x

Correct answer:

$y=\frac{x}{9}$

Explanation:

To find the inverse of a function we just switch the places of all and with eachother.

y=9x

turns into

x=9y

Now we solve for

Divide both sides by

$\frac{x}{9}=\frac{9y}{9}$

$y=\frac{x}{9}$

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Example Question #1 : Find The Inverse Of A Function

If $f(x)=-\frac{3x}{5}+11$ , what is its inverse function, $f^{-1}(x)$ ?

Possible Answers:

$f^{-1}(x)=-\frac{5x}{3}+\frac{55}{3}$

$f^{-1}(x)=-\frac{5x}{3}-\frac{55}{3}$

$f^{-1}(x)=-\frac{3x}{5}-\frac{33}{5}$

$f^{-1}(x)=-\frac{3x}{5}+\frac{33}{5}$

$f^{-1}(x)=\frac{5x}{3}+\frac{55}{3}$

Correct answer:

$f^{-1}(x)=-\frac{5x}{3}+\frac{55}{3}$

Explanation:

We begin by taking $f(x)=-\frac{3x}{5}+11$ and changing the f(x) to a , giving us $y=-\frac{3x}{5}+11$ .

Next, we switch all of our x's and y's , giving us $x=-\frac{3y}{5}+11$ .

Finally, we solve for by subtracting from each side, multiplying each side by , and dividing each side by , leaving us with,

$y=-\frac{5x}{3}+\frac{55}{3}$ .

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Example Question #4 : Find The Inverse Of A Function

Find the inverse of y =10x-1 .

Possible Answers:

$y = \frac{x+1}{10}$

x=10y+1

$y = \frac{x-1}{10}$

y = 10x+1

$x = \frac{y - 1}{10}$

Correct answer:

$y = \frac{x+1}{10}$

Explanation:

To find the inverse of the function, we switch the switch the and variables in the function.

y = 10x-1

Switching and gives

x = 10y -1

Then, solving for gives our answer:

x + 1 = 10y

$\frac{x-1}{10} = y$

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Example Question #11 : Find The Inverse Of A Function

Find the inverse of y = 2x +2 .

Possible Answers:

$y = -\frac{1}{2}x + 1$

$x=-\frac{1}{2}y-2$

$y = \frac{x+2}{2}$

$y = \frac{x-2}{2}$

$y = -\frac{1}{2}x - 2$

Correct answer:

$y = \frac{x-2}{2}$

Explanation:

To find the inverse of the function, we must swtich and variables in the function.

y = 2x+2

Switching and gives:

x= 2y +2

Solving for yields our final answer:

x -2 = 2y

$y= \frac{x-2}{2}$

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Example Question #12 : Find The Inverse Of A Function

Find the inverse of y = 4x -3 .

Possible Answers:

$y=-\frac{1}{4}x-\frac{3}{4}$

$y = \frac{x-3}{4}$

$y = -\frac{1}{4}x +3$

$y = \frac{x+3}{4}$

$y = -\frac{1}{4}x + \frac{3}{4}$

Correct answer:

$y = \frac{x+3}{4}$

Explanation:

To find the inverse of the function, we can switch and in the function and solve for :

y = 4x-3

Switching and gives:

x = 4y -3

Solving for yields our final answer:

4y = x+3

$y = \frac{x+3}{4}$

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Example Question #11 : Find The Inverse Of A Function

Find the inverse of y = 7x -3 .

Possible Answers:

$y= \frac{x+3}{7}$

$y= \frac{-x-3}{7}$

y=7(x-3)

$y = \frac{x-3}{7}$

$x = \frac{y-3}{7}$

Correct answer:

$y= \frac{x+3}{7}$

Explanation:

To find the inverse of the function, we can switch and in the function and solve for .

y = 7x -3

Switch and :

x = 7y -3

We can now solve for :

x + 3 = 7y

$y = \frac{x+3}{7}$

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Precalculus : Inverse Functions

Study concepts, example questions & explanations for Precalculus

All Precalculus Resources

Example Questions

Example Question #2 : Find The Inverse Of A Function

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Example Question #3 : Find The Inverse Of A Function

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Example Question #12 : Find The Inverse Of A Function

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