Graphing Logarithmic Functions

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Questions and Answers

The function $f(x) = log_3(x)$ has a domain of all real numbers.

False (B)

The graph of $f(x) = log_3(x)$ has a y-intercept at (0, 1).

False (B)

The function $f(x) = log_{\frac{1}{2}}(x) + 3$ has a vertical asymptote at $x = 3$.

False (B)

As $x$ approaches infinity for the function $f(x) = log_{\frac{1}{2}}(x) + 3$, $f(x)$ approaches positive infinity.

<p>False (B)</p> Signup and view all the answers

The graph of $f(x) = log_4(x + 5)$ is a transformation of $log_4(x)$ shifted 5 units to the right.

<p>False (B)</p> Signup and view all the answers

The range of the function $f(x) = log_4(x+5)$ is all real numbers.

<p>True (A)</p> Signup and view all the answers

The function $f(x) = log_3(x)$ has an x-intercept at (1, 0).

<p>True (A)</p> Signup and view all the answers

The graph of $f(x) = log_4(x + 5)$ has a y-intercept at $(0, log_4(5))$.

<p>True (A)</p> Signup and view all the answers

The asymptote of $f(x) = log_3(x)$ is $y = 0$.

<p>False (B)</p> Signup and view all the answers

The domain of $f(x) = log_4(x + 5)$ is $x > 5$.

<p>False (B)</p> Signup and view all the answers

Flashcards

Domain

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

Range

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

End Behavior

Describes the trend of the function's output as the input approaches positive or negative infinity.

x-intercept

Point where the graph intersects the x-axis.

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Asymptote

A line that a curve approaches but never touches.

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Logarithmic Function

f(x)=log_b(x), where b is the base, and x is the argument.

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Logarithmic Domain Restriction

The value 'x' must be greater than zero

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Vertical Shift

A vertical shift moves the entire function up or down on the y-axis.

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Horizontal Shift

A horizontal shift moves the entire function left or right on the x-axis.

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Study Notes

  • The homework is on graphing logarithmic functions.
  • Instructions include graphing each function and identifying its key characteristics.

Function 1: f(x) = log₃(x)

  • Need to determine the domain, range, end behavior, x-intercept, and asymptote.

Function 2: f(x) = log₁/₂(x) + 3

  • Need to determine the domain, range, end behavior, x-intercept, and asymptote.

Function 3: f(x) = log₄(x+5)

  • Need to determine the domain, range, end behavior, x-intercept, and asymptote.

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