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# Change of Base

## Log base b of x equals log of x divided by log of b with any new base.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
• Video

## Change of Base Formula - Overview

by CK-12 //basic
Overview
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• Video

## Using the Change-of-Base Formula - Overview

by CK-12 //basic
Overview
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• Video

## Change of Base Formula - Example 1

by CK-12 //basic
Rewrite the logarithm as a ratio of common logarithms
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• Video

## Change of Base Formula - Example 2

by CK-12 //basic
Rewrite the logarithm as a ratio of natural logarithms
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• Video

## Change of Base Formula - Example 3

by CK-12 //basic
Evaluate the logarithm using the change of base formula
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• Video

## Using the Change-of-Base Formula - Example 1

by CK-12 //basic
Evaluating logarithms Using the Change-of-Base Formula
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• Real World Application

## Harsh Rains

by CK-12 //basic
Learn about the causes of acid rain.
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