Logarithmic Functions - Mathematics Vision Project
SECONDARY MATH THREE
An Integrated Approach
MODULE 2
Logarithmic Functions
The Mathematics Vision Project Scott Hendrickson, Joleigh Honey, Barbara Kuehl, Travis Lemon, Janet Sutorius ? 2018 Mathematics Vision Project Original work ? 2013 in partnership with the Utah State Office of Education This work is licensed under the Creative Commons Attribution CC BY 4.0
SECONDARY MATH III // MODULE 2 LOGARITHMIC FUNCTIONS
MODULE 2 - TABLE OF CONTENTS
LOGARITHMIC FUNCTIONS
2.1 Log Logic ? A Develop Understanding Task Evaluate and compare logarithmic expressions. (F.BF.5, F.LE.4) Ready, Set, Go Homework: Logarithmic Functions 2.1
2.2 Falling Off a Log ? A Solidify Understanding Task Graph logarithmic functions with transformations (F.BF.3, F.BF.5, F.IF.7e) Ready, Set, Go Homework: Logarithmic Functions 2.2 2.3 Chopping Logs ? A Solidify Understanding Task Explore properties of logarithms. (F.IF.8, F.LE.4) Ready, Set, Go Homework: Logarithmic Functions 2.3 2.4 Log-Arithm-etic ? A Practice Understanding Task Use log properties to evaluate expressions (F.IF.8, F.LE.4) Ready, Set, Go Homework: Logarithmic Functions 2.4 2.5 Powerful Tens ? A Practice Understanding Task Solve exponential and logarithmic functions in base 10 using technology. (F.LE.4) Ready, Set, Go Homework: Logarithmic Functions 2.5
Mathematics Vision Project Licensed under the Creative Commons Attribution CC BY 4.0
CC BY Andrew Binham
SECONDARY MATH III // MODULE 2 LOGARITHMIC FUNCTIONS ? 2.1
2.1 Log Logic
A Develop Understanding Task
We began thinking about logarithms as inverse functions for exponentials in Tracking the Tortoise. Logarithmic functions are interesting and useful on their own. In the next few tasks, we will be working on understanding logarithmic expressions, logarithmic functions, and logarithmic operations on equations.
We showed the inverse relationship between exponential and logarithmic functions using a diagram like the one below:
Input
Output
1=3
/(1) = 23
2" = 8
3
/4-(1) = log)1
We could summarize this relationship by saying:
2" = 8 so, log)8 = 3
Logarithms can be defined for any base used for an exponential function. Base 10 is popular. Using base 10, you can write statements like these:
10- = 10
so, log-.10 = 1
10) = 100 so, log-.100 = 2
10" = 1000 so, log-.1000 = 3
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