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Log Functions and Graphs
Algebra & Trig. 4.3
7
Mathematics
Undergraduate 1
03/22/2008

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Cards

Term

 

 

 

Logarithmic Function, Base a

Definition
 
 
We define y = loga x as that number y such that x = a y, where x > 0 and a is a positive constant other than 1.
Term

 

 

 

The Logarithm of Base 1

Definition

For any logarithm base a,

 

loga 1 = 0

 

(This follows from the fact that a0 = 1.)

Term

 

 

 

Logarithm with the Same Base & Argument

Definition

For any logarithm base a,

 

loga a = 1

 

(This follows from the fact that a1 = a.)

Term

 

 

 

Converting between Exponential Notation

and Logarithmic Equations

Definition

 

 

 

loga x = y ↔  x = a y

Term

 

 

 

The Natural Logarithm of 1

Definition

For the logarithmic base e,

 

 

ln 1 = 0

 

 

Term

 

 

 

The Natural Logarithm of e

Definition
For the logarithmic base e,
 
 
ln e = 1.
Term

 

 

 

Change-of-Base Formula

Definition
For any logarithmic bases a and b, and any positive number M,
 
 
     logb M = loga M / loga b
 
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