Posted by **John** on Monday, February 7, 2011 at 1:19pm.

For all real and positve numbers p and q, the following identity holds:

(p^1/3 - q^1/3)(p^2/3 +(p^1/3)(q^1/3) + q^2/3) = (p - q)

Does this identity still hold for negative p and/or q?

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