Concept

Website Link

This tutorial illustrates finding the zeros of a quadratic function by factoring. 

sosmath.com

This tutorial illustrates finding the zeros of a quadratic function by completing the square 

This tutorial illustrates finding the zeros of a quadratic function using the quadratic formula 

This tutorial illustrates how to find the complex zeros of a quadratic function and factor the function over the complex numbers. 

sosmath

This tutorial illustrates how to find the zeros of a quadratic polynomial function by factoring and the  quadratic formula.
*Select the Precalculus Book and pick Polynomials.  Under polynomials select Factoring, Roots.

cow.math

This tutorial illustrates finding the zeros of a quadratic function by completing the square. 

themathpage

This tutorial covers factoring polynomials that are quadratic in form.

wtamu.edu

Concept

Website Link

This interactive tutorial shows how the constants a, b, and c      
change the graph of a quadratic function, .

This interactive tutorial shows how the constants a, h, and k
change the graph of a quadratic function, f(x) = a(x -h)^2 + k

analyzemath 

This interactive tutorial shows how to graph a quadratic function  
by finding the intercepts, vertex, and additional points.  It also  
discusses the domain and range of quadratic functions.

This lesson shows how to graph a quadratic function by   putting   the quadratic function in h, k form and then using stretches/shrinks, and shifts to sketch the graph. It also shows how to find the vertex using the midpoints of the x-intercepts.

uncwil.edu