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Khan Academy
Khan Academy: Algebra: Proof: A(log B) = Log (B^a), Log a Log B = Log (A/b)
Shows a proof of the logarithm power property and the property that division inside the log can be turned into subtraction outside the log. [7:58]
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]