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Solve the cubic equation $z^3+6z^2+12z+16=0$

and show the three solutions on an Argand diagram

HINT: $(a+b)^3$

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    Is that a question? What are your thoughts?2011-12-30
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    @David, the OP's own hint, namely recognizing the binomial expansion of $(z+2)^3+8=0$, seems to be easier than dividing out one of the solutions.2011-12-30
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    @Henning Makholm Indeed... Deleting my previous comments.2011-12-30

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