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2014-07-06T17:59:05+08:00

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Yes, because equations such as

 x^{2} -2x-2=0

have irrational roots. Therefore, it would be very difficult (but not impossible) to solve it by factoring method.
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2014-07-06T19:25:19+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Yes, because not all quadratic equation are factorable, some quadratic equation can be solve using the quadratic formula or completing the square
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