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OpenStudy (anonymous):
how can i find how many imaginary and real zeros this function has ? f(x) = x^3 - 20x^2 + 123x - 216
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OpenStudy (tkhunny):
Finding the Real one would be a good place to start. Have you tried the Rational Root Theorem, yet?
OpenStudy (e.mccormick):
Descartes' Rule of Signs is another good tool to use in this case. If your homework has those sorts of questions, the Rational Root Theorem and Descartes' Rule of Signs should be in that chapter.
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