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![Page 1: Unit 8: Logarithmic Functionsmsbourgeois2016.weebly.com/uploads/5/5/9/1/55918287/section_8.… · Section 8.1 Understanding Logarithmssoln.notebook 7 May 22, 2018 Apr 118:20 PM Comparing](https://reader035.vdocument.in/reader035/viewer/2022071014/5fccd1b39dc8df38af22b19f/html5/thumbnails/1.jpg)
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May 22, 2018
Apr 117:06 PM
Unit 8: Logarithmic Functions
Section 8.1: Understanding Logarithms
My favorite logs are logarithms
A logarithmic function is the inverse of an exponential function.
Inverse of a Function: We can determine an inverse by switching the x and y in the equation and then solving for y in
the new equation.
Note: When we switch the x and the y we essentially switch the domain and range. This results in the graphs being symmetrical with respect to the line y = x
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Complete the table of values for the exponential function y = 10x, and its inverse x = 10y. Then graph both function and the reflection line y = x.
Original Function: y = 10x Inverse: x = 10y
State the domain and range of each function. What do you notice?
Apr 117:13 PM
Given the exponential function where c > 1, the inverse becomes . However, we do not write the inverse as . Instead, we use a logarithmic function.
Example 1: Convert the following.
![Page 3: Unit 8: Logarithmic Functionsmsbourgeois2016.weebly.com/uploads/5/5/9/1/55918287/section_8.… · Section 8.1 Understanding Logarithmssoln.notebook 7 May 22, 2018 Apr 118:20 PM Comparing](https://reader035.vdocument.in/reader035/viewer/2022071014/5fccd1b39dc8df38af22b19f/html5/thumbnails/3.jpg)
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ORBEN the "log BuN""E"
Hints to remember!
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a) b) c)
a)
Example 2: Convert the following in logarithmic form.
Example 3: Convert the following to exponential form.
b) c)
![Page 4: Unit 8: Logarithmic Functionsmsbourgeois2016.weebly.com/uploads/5/5/9/1/55918287/section_8.… · Section 8.1 Understanding Logarithmssoln.notebook 7 May 22, 2018 Apr 118:20 PM Comparing](https://reader035.vdocument.in/reader035/viewer/2022071014/5fccd1b39dc8df38af22b19f/html5/thumbnails/4.jpg)
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Example 4: Evaluate each logarithm without the use of a calculator
a) b) c)
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Example 5: Determine the unknown value
a) b)
c) d)
e)
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Example 7: Evaluate each logarithmic expression, the nearest hundredth, using a calculator.
a) b) c)
Example 6: Use systematic trial and error to solve the following:
Mar 274:25 PM
To use the calculator we use the following
If the base is not 10 we can not simply use our calculators. What do
we do?
a) b) c)
Example 8: Evaluate the following using a calculator
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Example 9: If , determine
Example 10: If and , determine the value of m and n
p. 380 381 Q 2,3,4,12,13,14,20, 2224
May 510:57 PM
Here is a summary of some useful properties. The last 2 properties are sometimes called inverse properties since logarithms and powers are inverse mathematical operations that "undo" each other.
![Page 7: Unit 8: Logarithmic Functionsmsbourgeois2016.weebly.com/uploads/5/5/9/1/55918287/section_8.… · Section 8.1 Understanding Logarithmssoln.notebook 7 May 22, 2018 Apr 118:20 PM Comparing](https://reader035.vdocument.in/reader035/viewer/2022071014/5fccd1b39dc8df38af22b19f/html5/thumbnails/7.jpg)
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Comparing the Characteristics of Exponential and Log Functions.
Example 11: Below is a table for the exponential function and its inverse. Complete each table and sketch each graph on the same grid
How are these functions related?
Express as a logarithm.
Express using
Exponential Logarithmic
May 510:57 PM
Example 12: The point is on the graph of . If the point (k, 216) is on the graph of the inverse, determine the values of c and k
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