EXPONENTIAL EQUATION LOGARITHMIC EQUATION - Chandler Unified School ...
Algebra 2 16.1 (Day One) Properties of Logarithms
16.1 Notes Date: ___________
Properties of Logarithms
Logarithmic expressions can be rewritten using one or more properties of logarithms.
Learning Target A: I can use the properties of logarithms.
Recall that a logarithm is the exponent to which a base must be raised in order to obtain a given number.
EXPONENTIAL EQUATION LOGARITHMIC EQUATION
=
=
> ,
A) Determine each of the following to identify the definition-based properties of logs: If = ___________,
It follows that = ______, so = _______. Also, = _____, so = _________.
B) Just like we have exponent properties for powers of the same __________, we have log properties for logs of the same base! Fill in the table to determine the properties of operations with logs.
Exponent Properties
Logarithm Properties
Product
=
=
Quotient
=
=
Power
() =
=
Example 1. Expand each expression to be written in terms of log m and log n.
A) 25
B)
3 4
1
Algebra 2 C) 42
D)
4 2
16.1 Notes
Fill out the table with the properties of logarithms that you discovered on the first page.
Properties of Logarithms
For any positive numbers a, m, n, b, ( ), and c ( ), the following properties hold: 1. =
Definition-Based Properties
2. 1 = 0
3. = 1
Product Property of Logarithms Quotient Property of Logarithms
=
=
Power Property of Logarithms
=
Example 2. Express each expression as a single logarithm. Evaluate without a calculator, if possible.
A) ln 18 - 2 ln 3 + ln 4
B) ln 25 + 4 ln 5 - ln 125
C) log 6 + log 11
D) 3 250 - 23 10
E)
1 3
58
-
1 2
59
F)
5 2
716
+
2 3
7125
2
................
................
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