Khan Academy: Variables and Expressions: Evaluating Exponential Expressions 2

This video demonstrates how to evaluate an expression with two variables using substitution.

Video showing how to evaluate an expression which contains two variables.

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.

A video showing how to simplify an expression with like terms.

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]

Video shows how to simplify expressions showing multiplication and how to write products with variables without multiplication signs. Also shows how to evaluate expressions by substituting in specific variable values. [12:26]

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...

This video explains how to find the value of a number written in exponential notation. Practice problems are available. [1:15]

Video lesson on multiplying rational expressions and simplifying the result by factoring the difference of squares. Includes stating the domain of the expression. [4:52]