CH 2: Exponential functions
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Questions and Answers

What is the product rule of logarithms?

  • \(\log_b(xy) = \log_b(x) - \log_b(y)\)
  • \(\log_b(xy) = \log_b(x) + \log_b(y)\) (correct)
  • \(\frac{\log_k(x)}{\log_k(b)}\)
  • \(\frac{\log_b(x)}{\log_b(y)}\)
  • How do you convert a logarithm from one base to another using the Change of Base Formula?

  • \(\log_b(x) = \frac{\log_k(x)}{\log_k(b)}\) (correct)
  • \(\log_b(xy) = \log_b(x) - \log_b(y)\)
  • \(\log_b(x^p) = p \cdot \log_b(x)\)
  • \(\frac{\log_k(b)}{\log_k(x)}\)
  • What is a key strategy when graphing exponential functions?

  • Identify the x-intercept
  • Trace the horizontal asymptote (correct)
  • Plot points for several values of y
  • Mark the point (1, 0)
  • Which transformation does not apply to both exponential and logarithmic graphs?

    <p>Diagonal shifts</p> Signup and view all the answers

    How can exponential equations be often solved?

    <p>By isolating the exponential expression and applying logarithms</p> Signup and view all the answers

    What happens to an exponential graph with a positive stretch factor greater than 1?

    <p>It stretches vertically</p> Signup and view all the answers

    In which form can logarithmic equations be directly solved?

    <p>(\log_b(x^p) = p \cdot \log_b(x))</p> Signup and view all the answers

    What does the Power Rule of logarithms state?

    <p>(p \cdot \log_b(x))</p> Signup and view all the answers

    What is a key step in graphing logarithmic functions?

    <p>Mark the point (1, 0)</p> Signup and view all the answers

    What is the core attribute of an exponential function that determines whether it shows growth or decay?

    <p>The base, b</p> Signup and view all the answers

    In an exponential function, if the base is greater than 1, what type of behavior does the function exhibit?

    <p>Exponential growth</p> Signup and view all the answers

    Where is the y-intercept located in an exponential function regardless of the base?

    <p>(0, 1)</p> Signup and view all the answers

    What is the range of an exponential function in terms of real numbers?

    <p>(0, ∞)</p> Signup and view all the answers

    What property does a logarithmic function share with an exponential function?

    <p>Inverse relationship</p> Signup and view all the answers

    Where does a logarithmic function intersect the x-axis?

    <p>(1, 0)</p> Signup and view all the answers

    What is the domain of a logarithmic function in terms of real numbers?

    <p>(0, ∞)</p> Signup and view all the answers

    What does a logarithmic function give for a given x value?

    <p>The exponent to which x must be raised to yield b</p> Signup and view all the answers

    What is the y-intercept for an exponential function?

    <p>(0, 1)</p> Signup and view all the answers

    If the base of an exponential function is between 0 and 1, what type of behavior does the function exhibit?

    <p>Exponential decay</p> Signup and view all the answers

    What is the horizontal asymptote for most exponential functions?

    <p>y = 0</p> Signup and view all the answers

    In a logarithmic function, where does it intersect the x-axis?

    <p>(1, 0)</p> Signup and view all the answers

    For an exponential function with a base greater than 1, what is the domain of the function?

    <p>\(\mathbb{R})</p> Signup and view all the answers

    What is the principal property that defines the relationship between exponential and logarithmic functions?

    <p>Inverse relationship</p> Signup and view all the answers

    If an exponential function has a base greater than 1, what type of behavior does it exhibit?

    <p>Exponential growth</p> Signup and view all the answers

    What is the range of a logarithmic function in terms of real numbers?

    <p>\(\mathbb{R})</p> Signup and view all the answers

    What value does a logarithmic function give when evaluated at x=1?

    <p>+1</p> Signup and view all the answers

    What is the main purpose of the Change of Base Formula in logarithms?

    <p>Calculating logarithms with different bases</p> Signup and view all the answers

    How do vertical shifts affect both exponential and logarithmic graphs?

    <p>Translate the graph up or down</p> Signup and view all the answers

    In solving exponential equations, what is the primary purpose of applying logarithms?

    <p>To linearize the exponent</p> Signup and view all the answers

    Which aspect of exponential graphs can be determined by identifying the y-intercept and horizontal asymptote?

    <p>Behavior as x approaches infinity</p> Signup and view all the answers

    How do compressions impact the appearance of both exponential and logarithmic graphs?

    <p>Change the steepness of the graph</p> Signup and view all the answers

    When sketching a logarithmic graph, why is it important to mark the point (1, 0)?

    <p>To determine the y-intercept</p> Signup and view all the answers

    What transformation does NOT apply to both exponential and logarithmic graphs?

    <p>Reflections across axes</p> Signup and view all the answers

    In an exponential function, what does a positive stretch factor greater than 1 do to the graph?

    <p>Increase its steepness</p> Signup and view all the answers

    What is a key similarity between solving exponential and logarithmic equations?

    <p>Both involve isolating variables on one side</p> Signup and view all the answers

    What effect does a horizontal shift have on both exponential and logarithmic graphs?

    <p>Moves the graph left or right</p> Signup and view all the answers

    If an exponential function has a base between 0 and 1, what type of behavior does it exhibit?

    <p>Exponential decay</p> Signup and view all the answers

    What is the range of an exponential function in terms of real numbers?

    <p>Positive real numbers $(0, \infty)$</p> Signup and view all the answers

    If the base of a logarithmic function is greater than 1, what transformation would be required to graph it from the natural logarithm function?

    <p>A horizontal stretch</p> Signup and view all the answers

    What is the principal property that defines the inverse relationship between exponential and logarithmic functions?

    <p>$\log_b(b^x) = x$ and $b^{\log_b(x)} = x$</p> Signup and view all the answers

    If an exponential function has a base greater than 1, what type of behavior does it exhibit?

    <p>Exponential growth</p> Signup and view all the answers

    What is the horizontal asymptote for most exponential functions?

    <p>The x-axis ($y = 0$)</p> Signup and view all the answers

    What is the core attribute of an exponential function that determines whether it shows growth or decay?

    <p>The base $b$</p> Signup and view all the answers

    What is the domain of a logarithmic function in terms of real numbers?

    <p>Positive real numbers $(0, \infty)$</p> Signup and view all the answers

    What is the y-intercept for an exponential function?

    <p>(0, 1)</p> Signup and view all the answers

    Which logarithmic law states that the logarithm of a quotient is equal to the logarithm of the numerator minus the logarithm of the denominator?

    <p>Quotient Rule</p> Signup and view all the answers

    When sketching the graph of a logarithmic function, why is it important to mark the point (1, 0)?

    <p>It represents the y-intercept of the graph.</p> Signup and view all the answers

    What is the primary purpose of applying logarithms when solving exponential equations?

    <p>To convert the equation to a linear form.</p> Signup and view all the answers

    Which transformation does not apply to both exponential and logarithmic graphs?

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

    What is the range of a logarithmic function in terms of real numbers?

    <p>All positive real numbers</p> Signup and view all the answers

    According to the Power Rule of logarithms, what is the relationship between the logarithm of a power and the logarithm of the base?

    <p>$\log_b(x^p) = p \cdot \log_b(x)$</p> Signup and view all the answers

    What is the main purpose of the Change of Base Formula in the context of logarithms?

    <p>To convert logarithms from one base to another.</p> Signup and view all the answers

    If an exponential function has a base greater than 1, what type of behavior does the function exhibit?

    <p>Exponential growth</p> Signup and view all the answers

    What is the core attribute of an exponential function that determines whether it shows growth or decay?

    <p>The base of the exponential function</p> Signup and view all the answers

    What is a key similarity between solving exponential and logarithmic equations?

    <p>Both involve converting the equation to a linear form.</p> Signup and view all the answers

    What is the key difference between the domain of exponential and logarithmic functions?

    <p>Exponential functions have a domain of all real numbers, while logarithmic functions have a domain of positive real numbers.</p> Signup and view all the answers

    Which statement accurately describes the range of exponential functions?

    <p>The range of exponential functions is all positive real numbers.</p> Signup and view all the answers

    What characteristic helps distinguish between exponential decay and exponential growth?

    <p>The base of the exponential function</p> Signup and view all the answers

    Which property defines the relationship between logarithmic and exponential functions?

    <p>Logarithmic functions are the inverse of exponential functions.</p> Signup and view all the answers

    What does the y-intercept (0, 1) signify in an exponential function?

    <p>It shows where the function crosses the y-axis.</p> Signup and view all the answers

    Which logarithmic law states that the logarithm of a product is equal to the sum of the logarithms of the individual factors?

    <p>Product Rule</p> Signup and view all the answers

    If an exponential function has the form $f(x) = a^x$, where $a$ is the base, what is the condition on $a$ for the function to exhibit exponential growth?

    <p>$a &gt; 1$</p> Signup and view all the answers

    Suppose $\log_b(x) = y$. Which of the following expressions represents the conversion of this logarithm to base $k$?

    <p>$\log_k(x) = \frac{\log_b(y)}{\log_k(b)}$</p> Signup and view all the answers

    In solving an exponential equation of the form $a^x = b$, where $a$ and $b$ are constants, what is the primary step involving logarithms?

    <p>Apply the logarithm of base $a$ to both sides of the equation</p> Signup and view all the answers

    Which transformation applies to both exponential and logarithmic graphs, but in opposite directions?

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

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