Difference Between Two Squares

Finishing up his short series on rational expressions, Sal reviews the concept with another example. Those who have a hard time with rational expressions will appreciate the clarity with which Sal explains his process and methodology.

Just how much farther? A helpful video provides an example in determining an algebraic expression involving distance traveled. Graphics provide an illustration to demonstrate how to find the remaining distance to travel given a known...

Express yourself! Using a table method, the lesson presentation explains how to convert a verbal expression into an algebraic expression. The examples include problems with a variety of operations.

Variables are the name of the game. The video instructor explains the importance of defining a variable and then models how to write an expression. He reviews three different problem scenarios and then builds expressions to model each...

Expressing words as numbers and symbols ... that is the task at hand. Given a contextual situation, it is often necessary to rewrite the information as expressions. The video demonstration shows two examples of this concept and gives...

Turning words into symbols, a powerful application of mathematics. A video lesson explains how to rewrite a problem-solving question with expressions. The instructor emphasizes the need to define variables.

What do exponential expressions and lungs have in common? They both can expand and contract! A short video lesson shows how to expand exponential expressions. Examples include those with and without parentheses.

"The neat thing about completing the square is that it will always work," Sal explains, "no matter how crazy the problem is." A basic overview of how to complete the square, this video provides a good background for both beginning and...

The square root of five and five do not have the same value! How many times have you addressed this with math classes? A lesson gives an explanation of a square root and gives examples for simplifying square root expressions,...

Teach your class how to add two algebraic fractions with different denominators. The instructor in the video describes how to find the common denominator and demonstrates how to simplify the expression. A straightforward video, this...