Lesson 5

Some Functions Have Symmetry

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Problem 1

Classify each function as odd, even, or neither.

A graph of function a on a coordinate plane.
A graph of function b on a coordinate plane.
Graph of function c.
A graph of function d on a coordinate plane.

Solution

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Problem 2

The table shows the values of an even function \(f\) for some inputs.

\(x\) -4 -3 -2 -1 0 1 2 3 4
\(f(x)\) 2      8      10 -1      0     

Complete the table.

Solution

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Problem 3

Here is the graph of \(y = x -2\).

Graph of a line, origin O, no grid. X axis from negative 4 to 4 by 1’s. Y axis from negative 6 to 4 by 2’s. Line passes through 0 comma  negative 2 and 2 comma 0.  
  1. Is there a vertical translation of the graph that represents an even function? Explain your reasoning.
  2. Is there a vertical translation of the graph that represents an odd function? Explain you reasoning.

Solution

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Problem 4

The function \(f\) is odd. Which statements must be true? Select all that apply.

A:

If \(f(5) = 2\), then \(f(\text-5) = 2\).

B:

If \(f(5) = 3\), then \(f(\text-5) = \text-3\).

C:

Reflection over the \(y\)-axis takes the graph of \(f\) to itself.

D:

Reflecting \(f\) across both axes takes the graph of \(f\) to itself.

E:

\(f(0) = 0\)

Solution

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Problem 5

Find the exact solution(s) to each of these equations, or explain why there is no solution.

  1. \(\frac14 \sqrt[3]{d}=15\)
  2. \(\text- \sqrt[3]{e}=7\)
  3. \(\sqrt[3]{f-5}+2=4\)

Solution

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(From Unit 3, Lesson 8.)

Problem 6

Here is the graph of \(f\).

  1. Graph the function \(g\) given by \(g(x) = \text-f(x)\).
  2. Graph the function \(h\) given by \(h(x) = f(\text-x)\).
Graph of function f.

Solution

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(From Unit 5, Lesson 4.)

Problem 7

The graph models Priya's heart rate before, during, and after a run.

Graph of a function, origin O, heart rate (beats per minute) and time (hours after noon). 
  1. What was Priya's approximate heart rate before and after the run?
  2. About how high did Priya's heart rate get during the run?
  3. Sketch what the graph would look like if Priya went for the run three hours later.

Solution

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(From Unit 5, Lesson 2.)