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October 20, 2014

October 20, 2014

Posted by **Josh** on Monday, November 21, 2011 at 3:45pm.

1. x^3+27=0

2. x^3-8=0

- Pre Calculus -
**Damon**, Monday, November 21, 2011 at 5:37pm27+0 i = 27 e^i(0) = 27 cos 0 + i sin 0

27^(1/3)=3e^0 or 3e^i(2pi/3) or 3e^(4 pi/3)

= 3

or

= 3 cos 120 + 2i sin 120

= -1.5 + i sqrt 3

or

= -1.5 - i sqrt 3

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