Khan Academy: Algebra: Introduction to Logarithms

Sal crafts a demonstration around one of his "most misspelled words" - logarithms - in this thorough and understandable video. He defines a logarithm before using several examples to illustrate his point. Sal makes learning this concept...

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...

In this introduction to functions video, Sal intuitively defines a function and introduces the function notion f(x). He finishes the video by looking at a simple example of evaluating g(f(x)) without getting into the complexity of...

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 explains random variables, gives examples of what they are used for and explains the difference from traditional variables. Explains the difference between discrete and continuous random variables. Gives examples of using a random...

Explains how to solve quadratic equations, or find the roots of the equation, by factoring and by using the quadratic formula. Three different equations are solved. [9:14]

Video giving a general overview of the concept of a function by discussing inputs and outputs. Shows function notation, an example of a piece-wise function and how to evaluate at certain points as well as how to evaluate a composition of...

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.

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