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| Math Central | Quandaries & Queries |
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Question from RAM, a parent: The following Cubic Eqn should have three roots - what are they? x^3-27=0 |
RAM,
27 = 33 so x3 - 27 is a difference of cubes. Factor x3 - 33 as a difference of cubes. This will give you one root immediately. The other two can be found from the remaining factor using the general quadratic expression.
Penny
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