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Unread 01-02-2005, 19:57
Goobergunch Goobergunch is offline
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Re: Factoring 3rd degree polynomial

x^3 + 1 is a sum of two cubes, so you'd use the sum of two cubes formula:

Code:
a^3 + b^3 = (a+b)(a^2 - a*b + b^2)
With a=x and b=1, that results in (x+1)(x^2 - x + 1), which my TI-89 confirms.
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