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posted by tuhituhi on Tuesday, April 9, 2013 at 8:37am.

if x=2^1/3 + 2^2/3 show that x^3-6x =6

just plug and chug: x = ∛2+∛4 x^3 = (∛2+∛4)^3 = 2 + 3∛16 + 3∛32 + 4 = 2 + 6∛2 + 6∛4 + 4 = 6 + 6∛2 + 6∛4 now subtract 6x to get 6

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