Khan Academy: Algebra: What Is the Range of a Function?

After defining a simple function from a word problem, a short video shows how to find its domain and range. The instruction reinforces the definitions of domain and range with a concrete example.

The short example shown in this video starts with a given set of numbers in the domain and the range that represents a function. One needs to map the points on a coordinate plane.

Given the formula of a rational function, determine how it behaves around its vertical asymptote. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

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]

Video giving an overview of domain, range, relations, and function using mappings. Determines whether a specific set of ordered pairs is a function. [6:57]

Video defining the vertex and axis of symmetry for a parabola. Vertex is found for a specific function by completing the square to change the equation from standard form to vertex form and then reasoning through the equation. Axis of...

Video determining the domain and range of a relation given as a table of values. [2:43]

Video graphing a parabola by plotting the roots, vertex and axis of symmetry. Roots of the quadratic function are found by factoring. Vertex of the parabola is found by three different methods: taking the midpoint of the roots, finding...

Video graphing a quadratic function by evaluating it for seven different values and plotting the resulting points. [4:04]

The video resource shows worked examples of algebra concepts. Students watch a detailed problem on how to find the domain and range of a function. [3:34]