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5.4 Common and Natural Logarithmic Functions

5.4 Common and Natural Logarithmic Functions. Quiz next class ! Objectives: Evaluate common and natural logs with and without calculator Solve common and natural exponential and log equations by using an equivalent equation!

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5.4 Common and Natural Logarithmic Functions

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  1. 5.4 Common and Natural Logarithmic Functions Quiz next class! Objectives: Evaluate common and natural logs with and without calculator Solve common and natural exponential and log equations by using an equivalent equation! Graph and identify transformations of common and natural log functions

  2. Before Calculators We had Logs! • Very useful for astronomy, chemistry, physics, and engineering • Still important for sciences and engineering • Today: Two most important types of logs • Base 10 and Base e.

  3. Common Logarithms: Base 10

  4. Logarithms are Special Exponents Example 1: Evaluating Common Logarithms

  5. Example 2: using Equivalent Statements Can be helpful:

  6. Natural Logarithms: Base e (instead of base 10)

  7. Example 3: Evaluating Natural Logarithms: Ln Qu: How can we check to see if we did the calculations right?

  8. Example 4: Solving by Using an Equivalent Statement Qu: Do you see a statement?

  9. Graphs of Logarithmic Functions • Think of all the graphs of the different exponential functions: • The graphs of logarithmic functions have common characteristics also. What is the asymptote for each graph? Why is the domain of an exp. fn. the range of its corresponding log fn?

  10. Example 5: Transforming Logarithmic Functions

  11. Example 7: Solving Logarithmic Equations Graphically Understand the graph! What does the x and y values represent What is the input and output

  12. 5.4 Hmwr; p. 361: 1,3, 7-13odd, 23-37odd, 43-49odd, 67Study for Quiz 5.1/5.2/5.4

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