MTH 112: Analyzing Graphs of Functions

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Questions and Answers

Use the graph of the function to find the ______ and range of f. (Enter your answers using interval notation.)

domain

When using the Vertical Line Test, if any vertical line intersects the graph more than once, it is not a ______ of x.

function

To find the ______ of the function algebraically, set f(x) = 0 and solve for x.

zeros

To determine open intervals where a function is increasing, decreasing, or constant, analyze the ________ of the function.

<p>graph</p> Signup and view all the answers

When determining where a function is increasing, decreasing, or constant, the intervals should be expressed as open ______.

<p>intervals</p> Signup and view all the answers

Use a graphing utility to graph the function and visually determine the open ______ on which the function is increasing, decreasing, or constant.

<p>intervals</p> Signup and view all the answers

To verify results regarding increasing, decreasing, or constant intervals, create a ______ of values.

<p>table</p> Signup and view all the answers

The ______ rate of change of the function from $x_1$ to $x_2$ is the slope of the secant line passing through the points $(x_1, f(x_1))$ and $(x_2, f(x_2))$.

<p>average</p> Signup and view all the answers

To determine whether a function is even, odd, or neither, one must analyze its ______.

<p>symmetry</p> Signup and view all the answers

The graph of an even function is symmetric with respect to the ______.

<p>y-axis</p> Signup and view all the answers

Applying the Vertical Line Test to a graph is a visual technique used to determine if it represents $y$ as a ______ of $x$.

<p>function</p> Signup and view all the answers

When a function is neither even nor odd, it possesses ______ symmetry.

<p>no</p> Signup and view all the answers

A ______ function satisfies the condition $f(x) = f(-x)$ for all $x$ in its domain.

<p>even</p> Signup and view all the answers

If $h(x) = x^2 - 1$, the result of $h(-x)$ will show if the function is even, odd, or ______.

<p>neither</p> Signup and view all the answers

Functions like $f(x) = 6x^{3/2}$ that exhibit no symmetry are classified as ______.

<p>neither</p> Signup and view all the answers

To analyze a function's intervals of increasing, decreasing, or being constant, the correct type of ______ must be used.

<p>notation</p> Signup and view all the answers

When visually examining a graph, areas where the $y$-values rise as $x$ increases indicate the function is ______.

<p>increasing</p> Signup and view all the answers

A secant line is used to compute the ______ rate of change between two points on the graph.

<p>average</p> Signup and view all the answers

For the function $f(x) = x^2 - 4x + 9$, understanding how to compute its average ______ of change helps analyze its behavior.

<p>rate</p> Signup and view all the answers

Symmetry about the y-axis is a key indicator of an ______ function.

<p>even</p> Signup and view all the answers

The domain of a function is described using interval ______.

<p>notation</p> Signup and view all the answers

When a function's output does not increase or decrease over an interval, it is considered ______ on that interval.

<p>constant</p> Signup and view all the answers

Visually, the zeros of a function correspond to the points where the function's graph intersects the ______

<p>x-axis</p> Signup and view all the answers

Points such as relative minimums or maximums help summarize function traits and should be ______.

<p>approximated</p> Signup and view all the answers

Flashcards

Domain of a function

The set of all possible input values (x-values) for which a function is defined.

Range of a function

The set of all possible output values (y-values) that a function can produce.

Vertical Line Test

A test to determine if a graph represents a function. If any vertical line intersects the graph more than once, it is not a function.

Zeros of a function

A value of x for which f(x) = 0, graphically represented where the function crosses or touches the x-axis.

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Increasing interval

An interval where the function's y-value increases as x increases.

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Decreasing interval

An interval where the function's y-value decreases as x increases.

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Constant interval

An interval where the function's y-value remains constant as x increases.

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Relative Minimum

A point where the function value is smaller than all nearby points; the lowest point in a specific section of the graph.

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Relative Maximum

A point where the function value is larger than all nearby points; the highest point in a specific section of the graph.

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Even Function

A function where f(-x) = f(x); symmetric with respect to the y-axis.

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Odd Function

A function where f(-x) = -f(x); symmetric with respect to the origin.

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Average Rate of Change

The measure of how much a function's output changes per unit change in its input.

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Study Notes

  • This is homework for MTH 112 PreCalculus Algebra, Spring 2025, section 20380, MW 10:00.
  • The assignment is 1.5 Analyzing Graphs of Functions.
  • The due date for this assignment has passed and no changes can be made. The score is 72/75, or 96.0%.

Analyzing Graphs of Functions:

  • For the function graphed:
  • Domain: (-2,2]
  • Range: [-4,5]
  • f(-1) = -4
  • f(0) = -3
  • f(1) = -4
  • f(2) = 5
  • For the function graphed:
  • Domain: [-1,∞)
  • Range: (-∞,7.5]
  • f(-1) = 4
  • f(0) = 3
  • f(2) = 7
  • f(3) = 0
  • For the function graphed:
  • Domain: (-∞,1]∪(1,∞)
  • Range: (-3,∞)∪[4,8)
  • f(2) = 3
  • f(1) = 4
  • f(3) = 3
  • f(-1) = 6
  • For the function graphed:
  • Domain: (-∞,∞)
  • Range: (-∞,4]
  • f(-3) = -5
  • f(2) = 0
  • f(0) = 4
  • f(3) = -5
  • The graph does not represent y as a function of x based on the vertical line test.
  • The graph does represent y as a function of x based on the vertical line test.
  • Given f(x) = 2x^2 - 3x - 20, the zeros of the function are x = 4, -5/2.
  • Given f(x) = x^3/7 - 2x, the zeros of the function are x = 0, √14, -√14.
  • Given f(x) = 9x^3 - 72x^2 - x + 8, the zeros of the function are x = 8, 1/3, -1/3.
  • Given f(x) = 6x/(x+1), the zeros of the function is x = 1/6.
  • Given f(x) = (x + 6) / (2x^2 - 12), the zero of the function is x=-6.
  • Given f(x) = x^2 - 6x:
  • Increasing interval: (3,∞)
  • Decreasing interval: (-∞, 3)
  • Constant: DNE
  • Given f(x) = √(x^2-9):
  • Increasing interval: (3,∞)
  • Decreasing interval: (-∞,-3)
  • Constant: DNE
  • Given f(x) = x^3 - 6x^2 + 2:
  • Increasing interval: (-∞,0)∪(4,∞)
  • Decreasing interval: (0,4)
  • Constant: DNE
  • Given f(x) = |x + 3| + |x - 3|:
  • Increasing interval: (3,∞)
  • Decreasing interval: (-∞,-3)
  • Constant interval: (-3,3)
  • Given f(x) = {2x + 2, x ≤ -1; x^2 - 1, x > -1}:
  • Increasing interval: (-∞,-1)∪(0,∞)
  • Decreasing interval: (-1,0)
  • Constant: DNE
  • Given f(x) = 2x^4 - 4x^2:
  • Increasing intervals: (-1,0)∪(1,∞)
  • Decreasing intervals: (-∞,-1)∪(0,1)
  • Constant: DNE
  • The average rate of change of f(x) = x^2 - 4x + 9 from x₁ = 1 to x₂ = 6 is 3.0.
  • The function f(x) = x^6 - 2x^2 + 5 is even with y-axis symmetry.
  • The function g(x) = x^3 - 5x is odd with origin symmetry.
  • The function f(s) = 6s^(3/2) is neither even nor odd and has no symmetry.
  • h(x) = x^2 - 1 is an even function.
  • For the given graph:
  • Domain: [-4,5)
  • Range: [0, 9]
  • Zero of f: (3,0)
  • Increasing intervals: (-4,0)∪(3,5)
  • Decreasing interval: (0,3)
  • The function is neither.

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