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Quadratic Equations

After studying this section, you will be able to:

  • solve quadratic equations by factorising
  • solve quadratic equations by completing the square
  • solve quadratic equations by using the formula
  • solve simultaneous equations when one of them is quadratic

This animated video states that a quadratic is an expression featuring an unknown number which has been squared. Examples are used to show how to simplify quadratics by factorisation. Working with both positive and negative terms is shown. Plotting a quadratic equation on a graph is used to show why quadratics can have more than one value.

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