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2014-07-05T14:57:18+08:00

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Not all because we have different methods in factoring quadratic equations.
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2014-07-05T15:33:46+08:00

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No, not all can be solved by completing the square because this method requires the presence of the bx term from a x^{2} +bx+c=0.

For example, we can not use completing the square for  x^{2} -9 =0 because it does not have the middle term. However, this kind of equation may be easily solved using different methods such as extracting the square roots, etc.

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