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SAT II Math II : Solving Functions

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Example Questions

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Example Question #1 : Solving Functions

If f(x) = (3x+5)^2 , what must f(-2) be?

Possible Answers:

121

Correct answer:

Explanation:

Replace the value of negative two with the x-variable.

There is no need to use the FOIL method to expand the binomial.

f(-2) = (3(-2)+5)^2 = (-6+5)^2 = (-1)^2 = 1

The answer is:

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Example Question #1 : Solving Linear Functions

Let f(x) = -3x+9 . What is the value of $f(\frac{7}{8})$ ?

Possible Answers:

$\frac{51}{4}$

$\frac{17}{3}$

$\frac{51}{8}$

$\frac{17}{2}$

Correct answer:

$\frac{51}{8}$

Explanation:

Substitute the fraction as .

$f(\frac{7}{8}) = -3(\frac{7}{8})+9$

Multiply the whole number with the numerator.

$\frac{-21}{8}+9$

Convert the expression so that both terms have similar denominators.

$-\frac{21}{8}+\frac{9(8)}{1(8)} = -\frac{21}{8}+\frac{72}{8}$

The answer is: $\frac{51}{8}$

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Example Question #51 : Functions And Graphs

If f(x) = 5 , what must f(10) be?

Possible Answers:

Correct answer:

Explanation:

A function of x equals five. This can be translated to:

y=5

This means that every point on the x-axis has a y value of five.

Therefore, f(10) =5 .

The answer is:

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Example Question #1 : Solving Exponential, Logarithmic, And Radical Functions

Rewrite as a single logarithmic expression:

$\ln (y+ 1) - \ln (y + 2) + \ln (y + 3)$

Possible Answers:

$= \ln \frac{y^{2}+4y + 3}{y + 2}$

$\ln \frac{y^{2}+3}{y + 2}$

$\ln \left (y + 2 \right )$

$= \ln \frac{y+1}{y^{2}+5y+6}$

$\ln \left (y + 4 \right )$

Correct answer:

$= \ln \frac{y^{2}+4y + 3}{y + 2}$

Explanation:

Using the properties of logarithms

$\ln a - \ln b = \ln \frac{a}{b}$ and $\ln a + \ln b = \ln ab$ ,

simplify as follows:

$\ln (y+ 1) - \ln (y + 2) + \ln (y + 3)$

$= \ln \frac{y+ 1}{y + 2} + \ln (y + 3)$

$= \ln \left [\frac{y+ 1}{y + 2} \cdot (y + 3) \right ]$

$= \ln \frac{y^{2}+4y + 3}{y + 2}$

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Example Question #1 : Solving Exponential, Logarithmic, And Radical Functions

Simplify by rationalizing the denominator:

$\frac{11}{6- \sqrt{3}}$

Possible Answers:

$2+ \sqrt{3}$

$\frac{6+ \sqrt{3}}{3 }$

$\frac{6- \sqrt{3}}{3 }$

$\frac{11\sqrt{3}}{3}$

$2- \sqrt{3}$

Correct answer:

$\frac{6+ \sqrt{3}}{3 }$

Explanation:

Multiply the numerator and the denominator by the conjugate of the denominator, which is $6 + \sqrt{3}$ . Then take advantage of the distributive properties and the difference of squares pattern:

$\frac{11}{6- \sqrt{3}}$

$= \frac{11(6+ \sqrt{3})}{\left (6- \sqrt{3} \right )(6+ \sqrt{3})}$

$= \frac{11(6+ \sqrt{3})}{ 6^{2}- \left (\sqrt{3} \right ) ^{2}\right }$

$= \frac{11(6+ \sqrt{3})}{36-3 }$

$= \frac{11(6+ \sqrt{3})}{3 3 }$

$= \frac{6+ \sqrt{3}}{3 }$

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Example Question #3 : Solving Exponential, Logarithmic, And Radical Functions

Simplify:

$\sqrt[3]{\sqrt[2]{x^{-9}}}$

You may assume that is a nonnegative real number.

Possible Answers:

$\frac{ \sqrt{x}}{x^{2}}$

$\frac{1}{x^{3}}$

$x \sqrt{x}$

$\sqrt[3]{x}$

$\frac{ \sqrt[3]{x}}{x }$

Correct answer:

$\frac{ \sqrt{x}}{x^{2}}$

Explanation:

The best way to simplify a radical within a radical is to rewrite each root as a fractional exponent, then convert back.

First, rewrite the roots as exponents.

$\sqrt[3]{\sqrt[2]{x^{-9}}} = \sqrt[3]{\left ( x^{-9} \right ) ^{\frac{1}{2}} } = \left ( \left ( x^{-9} \right ) ^{\frac{1}{2}} \right )^{\frac{1}{3}} = x ^{-9 \cdot \frac{1}{2} \cdot \frac{1}{3}} } } = x ^{- \frac{3}{2} } }= \frac{1}{x^{\frac{3}{2}}}$

Then convert back to a radical and rationalizing the denominator:

$\frac{1}{x^{\frac{3}{2}}} = \frac{1}{\sqrt {x^{3}}} = \frac{1 \cdot \sqrt{x}}{\sqrt {x^{3} \cdot \sqrt{x}}} = \frac{ \sqrt{x}}{\sqrt {x^{4} }} =\frac{ \sqrt{x}}{x^{2}}$

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Example Question #4 : Solving Exponential, Logarithmic, And Radical Functions

Let $f(x) = 2^{x}+ 3^{2x}$ . What is the value of f(-2) ?

Possible Answers:

$\frac{1}{85}$

$\frac{85}{324}$

$\textup{The answer is not given.}$

Correct answer:

$\frac{85}{324}$

Explanation:

Replace the integer as .

$f(-2) = 2^{-2}+ 3^{2(-2)} = 2^{-2}+ 3^{-4}$

Evaluate each negative exponent.

$2^{-2} = \frac{1}{2^2} = \frac{1}{4}$

$3^{-4} = \frac{1}{3^4} = \frac{1}{81}$

Sum the fractions.

$\frac{1}{4}+\frac{1}{81} = \frac{1(81)}{4(81)}+\frac{1(4)}{81(4)} = \frac{85}{324}$

The answer is: $\frac{85}{324}$

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Example Question #1 : Solving Exponential, Logarithmic, And Radical Functions

Find : $\sqrt{-3x-5} = 7$

Possible Answers:

Correct answer:

Explanation:

Square both sides to eliminate the radical.

$(\sqrt{-3x-5}) ^2= 7^2$

-3x-5 = 49

Add five on both sides.

-3x-5 +5= 49+5

-3x = 54

Divide by negative three on both sides.

$\frac{-3x}{-3} = \frac{54}{-3}$

The answer is:

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Example Question #1 : Solving Functions

If $f(x) = 2\sqrt{x}-\sqrt{x-3}$ , what is the value of f(-3) ?

Possible Answers:

$2i\sqrt3 -i\sqrt6$

-12i

$i\sqrt6$

$-2i\sqrt3$

Correct answer:

$2i\sqrt3 -i\sqrt6$

Explanation:

Substitute the value of negative three as .

$f(-3) = 2\sqrt{-3}-\sqrt{(-3)-3}$

$2\sqrt{-3}-\sqrt{-6} = 2\sqrt{-1}\cdot \sqrt{3} - \sqrt{-1}\cdot \sqrt{6}$

The terms will be imaginary. We can factor out an $i = \sqrt{-1}$ out of the right side. Replace them with .

The answer is: $2i\sqrt3 -i\sqrt6$

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Example Question #1 : Solving Quadratic Functions

A baseball is thrown straight up with an initial speed of 60 feet per second by a man standing on the roof of a 100-foot high building. The height of the baseball in feet as a function of time in seconds is modeled by the function

$h(t) = -16t^{2}+60t + 100$

To the nearest tenth of a second, how long does it take for the baseball to hit the ground?

Possible Answers:

$1.3\textrm{ sec}$

$6.4\textrm{ sec}$

$5.0 \textrm{ sec}$

$3.8\textrm{ sec}$

$100\textrm{ sec}$

Correct answer:

$5.0 \textrm{ sec}$

Explanation:

When the baseball hits the ground, the height is 0, so we set $h\left ( t\right ) = 0$ . and solve for .

$-16t^{2}+60t + 100 = 0$

This can be done using the quadratic formula:

$t = \frac{-b \pm \sqrt{b^{2}-4ac}}{2a}$

Set a = -16, b = 60, c = 100 :

$t = \frac{-60 \pm \sqrt{60^{2}-4(-16)100}}{2(-16)}$

$t = \frac{-60 \pm \sqrt{3,600- (- 6,400)}}{-32}$

$t = \frac{-60 \pm \sqrt{3,600+6,400}}{-32}$

$t = \frac{-60 \pm \sqrt{10,000}}{-32}$

$t = \frac{-60 \pm 100}{-32}$

One possible solution:

$t = \frac{-60 + 100}{-32} = \frac{40}{-32} = -1.25$

We throw this out, since time must be positive.

The other:

$t = \frac{-60 - 100}{-32} = \frac{-160}{-32} = 5$

This solution, we keep. The baseball hits the ground in 5 seconds.

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SAT II Math II : Solving Functions

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

All SAT II Math II Resources

Example Questions

Example Question #1 : Solving Functions

Example Question #1 : Solving Linear Functions

Example Question #51 : Functions And Graphs

Example Question #1 : Solving Exponential, Logarithmic, And Radical Functions

Example Question #1 : Solving Exponential, Logarithmic, And Radical Functions

Example Question #3 : Solving Exponential, Logarithmic, And Radical Functions

Example Question #4 : Solving Exponential, Logarithmic, And Radical Functions

Example Question #1 : Solving Exponential, Logarithmic, And Radical Functions

Example Question #1 : Solving Functions

Example Question #1 : Solving Quadratic Functions

All SAT II Math II Resources

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