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Tool: Quadratic Equations 2
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Description: Choose values of p and q in the equation x^2 + px + q = 0, and see determinations of the real roots by completing the square and use of the quadratic formula as well as a graphical visualization of the roots.
Technology Type: Java Applet 
Authors: Franz Embacher and Petra Oberhuemer
maths online
Language: English 
Cost: Does not require payment for use

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Courses: Algebra Quadratic Equations, Completing the Square, Quadratic Formula, Graphing
Algebra II Completing the square, Graphing

Comment:I think it's nice to use the graph and tie in the idea of two, one or no real roots for a quadratic, and the steps of completing the square are shown nicely. The quadratic formula is not the form traditionally used in American texts.