>>> Intro | Quadratic equations | Coordinate geometry | Complex numbers | Conclusion
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>>> Intro | Quadratic equations | Coordinate geometry | Complex numbers | Conclusion |
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| Solving quadratic
equations All quadratic equations can be solved using the formula:  If you have installed the  plugin (see Tech), use the
following interactive display to solve quadratic equations. Change the values
of a, b and c displayed between the red lines. |
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| The sum and product
of the two roots is also shown above. When the roots of the equation are
complex roots, they are always complex
conjugates. You will find that the sum and product are always real numbers -
even when the roots are complex!
>>> Intro | Quadratic equations | Coordinate geometry | Complex numbers | Conclusion |