Khan Academy: Logarithm Properties: Sum of Logarithms With Same Base

Sal gets to the heart of this video, clarifying that it's important to understand math "so you can apply it later on and not have to relearn everything every time." True to his word, Sal demonstrates ways to solve logs and exponents more...

Explore logarithm properties through change of base formula.

Explore logarithm properties through change of base formula proofs.

Introduction to the first two logarithm properties.

Using Multiple Logarithm Properties to Simplify

Proof of the logarithm property: log a + log b = log ab

Proofs of the logarithm properties: A(log B) = log (B^A) and log A - log B = log (A/B)

Logarithm of a Power

Demonstrates how to apply the logarithm property regarding the sum of logarithms with the same base to simplify a logarithmic expression. [5:04]

Proof that the sum of the angles in a triangle is 180 using the relationship of angles formed when parallel lines are cut by a transversal. This video also appears in the Geometry: Triangles strand. [6:31]