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81x^3-192=0
 Jan 23, 2014
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You sure this is a difference of cubes? 192 definitely isn't a perfect cube. The cube root of 192 is about 5.77 But anyways
8x 3 -192

(2x-5.77)(4x 2+11.54x+33.29)
 Jan 23, 2014

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