Johnny and Mary Do Maths
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The Discriminant
Significant Figures and Rounding: Questions & Answers
Polynomials Test
Polynomials: Answers
Using Geogebra
Why is a Raven like a Writing Desk?
Solutions for Simultaneous Equations
Simultaneous Equations
Factorising Polynomials
Saturday, October 30, 2010
The Discriminant
The quadratic equation y = ax
2
+ bx + c, represents a parabola. Play with the sliders in the geogebra applet to see the effect of positive or negative a, b and/or c. What happens when b
2
– 4ac is negative, when b
2
– 4ac = 0, or when b
2
– 4ac > 0?
Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and active in your browser (
Click here to install Java now
)
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