Quadratic functions are very commonly used both in an Algebra course and in the real world. In this section, the topics of equations, functions, graphs, word problems, and various other topics involving quadratics will be explored.

Quadratic Equations

 Learn how to solve quadratic equations utilizing many different techniques. The quadratic formula can be used to solve all quadratic equations. Factoring quadratic equations can only be used if the function is factorable. If the linear term is missing, the square root method can be used.

Solve by Factoring Ex 1
Solve by Factoring Ex 2
Solve by Factoring Ex 3
Solve by Square Root Method
Solve Using the
Quadratic Formula Ex 1
Quadratic Formula
No Real Solutions
Throwing a Ball from a Building Application


 Learn how to graph quadratic functions using different techniques. Techniques include using transformations of the parent function, finding the vertex and intercepts, and graph using intercepts when the vertex is on the x-axis. The graph is called a parabola. A parabola can open up and have a minimum point, or the graph can open down and have a maximum. The domain is always all real numbers, and the range depends on the direction of opening and the location of the vertex.

Graph a Quadratic in Vertex Form Using Translations
Vertical Stretches or Compressions of Quadratic Graphs
Using Vertex and Intercepts to Graph
Using Intercepts to Graph a Quadratic Function
Graph a Parabola Using Vertex and Intercepts (down)


 Quadratic functions are functions that are degree 2 polynomials. That means the highest exponent on a variable is two. Function notations is useful, because then you know what you plugged in for x to get the output. In some Algebra courses, you will have to find the quadratic function that passes through a given point with a given vertex.

Find the Function with the Given Vertex and y-intercept
Find the Function with the Given Vertex and a Point


 Extrema are the extreme points of a graph. They are the maximum and/or minimum points of a graph. All quadratic functions either have a maximum value or a minimum value. The maximum occurs if the parabola opens downward, and the minimum occurs if the parabola opens upward. The maximum or minimum occur at the vertex (turning point) of the graph. The maximum or minimum is the y-coordinate only.

Find the Maximum
Find the Minimum
Find Maximum Revenue
Find Minimum Cost