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Posted by **sue** on Friday, December 9, 2011 at 4:53pm.

f(x) = x^3 - 125

????????

- algebra -
**Reiny**, Friday, December 9, 2011 at 6:55pmwe have a difference of cubes

x^3 - 125 = (x-5)(x^2 + 5x + 25)

the quadratic has complex roots of

x = (-5 ± √-75)/2

= (-5 ± 5√-3)/2

= (-5 ± 5√3 i )/2

- algebra -
**sue**, Sunday, December 11, 2011 at 1:39pmwhat does the question mark mean????

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