Khan Academy: Algebra: Variables and Expressions 1

Video solving for the domain and range of a specific function defined verbally. Equation for function is found before defining the domain and range. [3:36]

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 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 how to simplify rational expressions. Includes writing restrictions for simplified expressions. [15:22]

Demonstrates how to find common denominators of rational expressions in order to subtract the given rational expressions. [5:35]

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

Video lesson involving multiplying two rational expressions, simplifying the result and then stating the domain of the expression. [3:38]

Video showing how to add and subtract rational expressions by finding a common denominator and then simplifying the result. Also includes finding the domain of the result. [8:15]

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]