Khan Academy: Algebra: Sum of Logarithms With Same Base

Sum of Logarithms with Same Base

Evaluate any logarithm in a calculator with the use of the change of base formula. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Identifies the properties for adding and subtracting logarithms with the same base. Practice problems available. [9:15]

Identifies two properties of logarithms: logarithm of a power and the change of base formula. Also completes one example problem of showing how to apply the properties. Practice problems available. [10:04]

Video showing how to add and subtract numbers using significant figures. Contrasts adding and subtracting with significant figures with multiplying and dividing. [8:59]

Explains what a logarithm is and the relationship between logarithms and exponents. Practice problems available. [9:48]

Video demonstrates how to divided a multivariable trinomial by a multivariable monomial. [3:14]

Evaluate basic logarithmic expressions. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Evaluate advanced logarithmic expressions by using the fact that a^x=b is equivalent to log_a(b)=x. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Demonstrates how to convert a logarithmic equation to an exponential equation. [1:27]