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OpenStudy (anonymous):
in descartes' rule of signs, say the equations is x^4-x^2+4. If we are looking for how many times the sign changes would x^4 to 0x^3 count as a sign change?
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OpenStudy (amistre64):
i believe teh zero coeff is simply ignored; its a term by term count
OpenStudy (amistre64):
x^4 -x^2 +4 simply has 2 changes
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