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SAT II Math I : Solving Exponential Functions

Study concepts, example questions & explanations for SAT II Math I

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Example Questions

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Example Question #1 :Solving Exponential Functions

Solve the following function:

$11=x^{2}-5$

Possible Answers:

and

Correct answer:

and

Explanation:

You must getby itself so you must addto both side which results in

$16=x^{2}$ .

You must get the square root of both side to undue the exponent.

This leaves you with x=4 .

But since you square thein the equation, the original value you plug can also be its negative value since squaring it will make it positive anyway.

This means your answer can be x=4 or x=-4 .

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Example Question #2 :Solving Exponential Functions

What is the horizontal asymptote of the graph of the equation $y = -2e^{x-3} -5$ ?

Possible Answers:

y=-5

y=3

y=-2

$y=-\frac{5}{2}$

y=5

Correct answer:

y=-5

Explanation:

The asymptote of this equation can be found by observing that $e^{x-3} > 0$ 不管. We are thus solving for the value ofas $e^{x-3}$ approaches zero.

$-2e^{x-3} < -2\cdot 0$

$-2e^{x-3} < 0$

$-2e^{x-3} -5 < 0-5$

$-2e^{x-3} -5 < -5$

y<-5

So the value thatcannot exceed is, and the line y = -5 is the asymptote.

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Example Question #1 :Solving And Graphing Exponential Equations

What is/are the asymptote(s) of the graph of the function

$f(x) = 5e^{x-2}-2$ ?

Possible Answers:

x=2

y = -2, x=2

y = -2, x=-2

y = -2

x=-2

Correct answer:

y = -2

Explanation:

An exponential equation of the form $f(x) = ae^{x-h} +k$ has only one asymptote - a horizontal one at y = k . In the given function, k = -2 , so its one and only asymptote is y = -2 .

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Example Question #1 :Find The Equations Of Vertical Asymptotes Of Tangent, Cosecant, Secant, And Cotangent Functions

Find the vertical asymptote of the equation.

$y=\frac{x^2-9}{x^2-16}$

Possible Answers:

x=1

x=4

x=4, -4

x=0

There are no vertical asymptotes.

Correct answer:

x=4, -4

Explanation:

To find the vertical asymptotes, we set the denominator of the function equal to zero and solve.

0=x^2-16

16=x^2

$\sqrt{16}=\sqrt{x^2}$

4, -4=x

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Example Question #1 :Solving Exponential Functions

Consider the exponential function y=2^x+3 . Determine if there are any asymptotes and where they lie on the graph.

Possible Answers:

There is one vertical asymptote at y=3 .

There is one horizontal asymptote at y=3 .

There are no asymptotes.goes to positive infinity in both theanddirections.

There is one vertical asymptote at y=2 .

Correct answer:

There is one horizontal asymptote at y=3 .

Explanation:

For positivevalues,increases exponentially in thedirection and goes to positive infinity, so there is no asymptote on the positive-axis. For negativevalues, asdecreases, the term 2^x becomes closer and closer to zero soapproachesas we move along the negativeaxis. As the graph below shows, this is forms a horizontal asymptote.

Exp_asymp

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Example Question #1 :Solving Exponential Functions

Solve the equation for.

$\small 9^x=3^6$

Possible Answers:

$\small x=2$

$\small x=0$

$\small x=3$

$\small x=1$

Correct answer:

$\small x=3$

Explanation:

Begin by recognizing that both sides of the equation have a root term of.

$\small 9^x=3^6$

(3^2)^x=3^6

Using the power rule, we can set the exponents equal to each other.

$3^{(2*x)}=3^6$

$\small 2x=6$

$\small x=3$

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Example Question #2 :Solving Exponential Functions

Solve the equation for.

$\small 3^{2x}=81$

Possible Answers:

x=4

x=9

x=3

x=1

x=2

Correct answer:

x=2

Explanation:

Begin by recognizing that both sides of the equation have the same root term,.

$\small 3^{2x}=81$

$\small 3^{2x}=9^2$

$3^{2x}=(3^2)^2$

We can use the power rule to combine exponents.

$3^{2x}=3^4$

Set the exponents equal to each other.

2x=4

$\small x=2$

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Example Question #2 :Solving And Graphing Exponential Equations

In 2009, the population of fish in a pond was 1,034. In 2013, it was 1,711.

Write an exponential growth function of the form $y=ab^{x}}$ that could be used to model, the population of fish, in terms of, the number of years since 2009.

Possible Answers:

y=1.2(1711)^x

y=1.1(1034)^x

y=1711(1.3932)^x

y=1.35(1.0011)^x

y=1034(1.1342)^x

Correct answer:

y=1034(1.1342)^x

Explanation:

Solve for the values ofaandb:

In 2009, y=1034 and x=0 (zero years since 2009). Plug this into the exponential equation form:

$1034=ab^{(0)}$ .Solve forto get.

In 2013, y=1711 and x=4 . Therefore,

1711=ab^4 or 1711=(1034)b^4 .Solve forto get

$b=\sqrt[4]{\frac{1711}{1034}}\approx1.1342$ .

Then the exponential growth function is

$y=1034(1.1342)^{x}$ .

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Example Question #8 :Solving Exponential Functions

$4^{5x}=8^{4x-1}$

Solve for.

Possible Answers:

1.5

Correct answer:

1.5

Explanation:

8 and 4 are both powers of 2.

$4^{5x}=8^{4x-1}$

$2^{10x}=2^{12x-3}$

10x=12x-3 -2x=-3 x=1.5

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Example Question #9 :Solving Exponential Functions

Solve for:

$80^{2x+3}=80^{5x-9}$

Possible Answers:

x=4

x=2

$x=\frac{1}{4}$

No solution

x=80

Correct answer:

x=4

Explanation:

Because both sides of the equation have the same base, set the terms equal to each other.

2x+3=5x-9

Add 9 to both sides: 2x+12=5x

Then, subtract 2x from both sides: 12=3x

Finally, divide both sides by 3: x=4

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SAT II Math I : Solving Exponential Functions

Study concepts, example questions & explanations for SAT II Math I

All SAT II Math I Resources

Example Questions

Example Question #1 :Solving Exponential Functions

Example Question #2 :Solving Exponential Functions

Example Question #1 :Solving And Graphing Exponential Equations

Example Question #1 :Find The Equations Of Vertical Asymptotes Of Tangent, Cosecant, Secant, And Cotangent Functions

Example Question #1 :Solving Exponential Functions

Example Question #1 :Solving Exponential Functions

Example Question #2 :Solving Exponential Functions

Example Question #2 :Solving And Graphing Exponential Equations

Example Question #8 :Solving Exponential Functions

Example Question #9 :Solving Exponential Functions

All SAT II Math I Resources

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