Khan Academy: Algebra: Variable Expressions

This video introduces to students what a variable, expression, and equation is. It also demonstrates how to substitute values for variables and evaluate expressions and equations using substitution. [6:55]

This video demonstrates how to evaluate an expression with two variables using substitution. [1:46]

This video demonstrates how to solve a word problem using an expression and substituting values for a variable. [2:00]

Video finding the volume of a cube with sides that are an algebraic expression involving exponents. [2:31]

A self-assessment on using variable expressions in JavaScript.

Video first finding the square root of an integer and then working towards finding larger roots of numbers by utilizing fractional exponents and exponent rules. Highest root is the 6th root. Includes an example with a variable. Video is...

Video simplifying a rational algebraic expression using the power of a power, power of a product and quotient of powers rules. [3:35]

Video simplifying a rational algebraic expression with fractional exponents and a square root. [6:32]

Video evaluating an exponential expression using the order of operations. [2:41]

Video shows examples of multiplying and dividing rational expressions. Includes adding restrictions to the simplified answer. [9:19]