When Doing The Problems... determining and positive or negative real zeros i always get them wrong... I Just Dont Get It... Ex. f(x)= 2x^4-x^3+6x^2-x+5 how is it 4 or 2 or 0 positive real zeros? None Negatives?
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Descartes' Sign Rule -- from Wolfram MathWorld Can you state Descartes's Rule Of Signs ?
Originally Posted by Plato Descartes' Sign Rule -- from Wolfram MathWorld Can you state Descartes's Rule Of Signs ? I Can... But Somehow I dont Know How... The Numbers Of Zeros End Up One Less Than The actual zeros...
Originally Posted by Plato Can you state Descartes's Rule Of Signs ? so in other words yu start counting changes from, lets say from my example: 5? but why would there be 4 or 2 or 0 positive zeros?
Originally Posted by >_<SHY_GUY>_< but why would there be 4 or 2 or 0 positive zeros? Well there are four changes in sign. So there are 4, 4-2=2, or 4-4=0 positive roots.
Oh... now i get it! these texts books are not good at explaining... they use some other method.... it confuses the whole class. and the teacher goes sometimes by the book... thanks!
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