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OpenStudy (anonymous):
How do I solve x^4-15x^2-6x+(73-r^2) by hand? r is constant.
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OpenStudy (phi):
Painfully... See http://en.wikipedia.org/wiki/Quartic_function You have a depressed quartic (i.e. missing the x^3 term), so it is a bit simpler than the general case. Search for depressed quartic on the wikipedia page. It is ugly, but doable.
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