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OpenStudy (anonymous):
The function f(x)=x^3-5x^2-2x=24 is positive for what parts of its domain?
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OpenStudy (anonymous):
Well in this situation the best thing to do would be to simplify it.. into factors. then you have ranges of test cases to test whether a number is positive in that range
OpenStudy (anonymous):
can you factor it?
OpenStudy (anonymous):
yep! thanks!
OpenStudy (anonymous):
is it \[ f(x)=x^3-5x^2-2x+24\]
OpenStudy (anonymous):
yeah!
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OpenStudy (anonymous):
did you factor? once you have the three zeros, because this is a third degree polynomial with positive leading coefficient you know it will be negative, then positive, then negative, then positive
OpenStudy (anonymous):
|dw:1353208613053:dw|
OpenStudy (anonymous):
|dw:1353208683477:dw|
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