Finding Cubic Roots of a polynomial and using Argand Diagrams
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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: $(a+b)^3$
polynomials
asked 2011-12-30
user id:21997
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22bronze badges
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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