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Khan Academy
Khan Academy: Algebra: Sum of Logarithms With Same Base
Demonstrates how to apply the logarithm property regarding the sum of logarithms with the same base to simplify a logarithmic expression. [5:04]
Khan Academy
Khan Academy: Algebra: Introduction to Logarithm Properties
Identifies the properties for adding and subtracting logarithms with the same base. Practice problems available. [9:15]