Sunday, 26 September 2010

Discriminating Algebra

The lower sixth are learning about that very important expression, the discriminant.

The discriminant is the part of the quadratic formula....



........ that determines the number and nature of the roots of a quadratic equation.

To investigate how the discriminant affects the roots we can look at a graph of a quadratic function and see where it crosses the x-axis.

Mr Waldomaths has created an applet that demonstrates the relationship between the discriminant and the roots graphically.

Click here to have a go!

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