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anonymous

  • 4 years ago

Can someone try to explain Descartes' Rule of Signs to me?

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  1. dumbcow
    • 4 years ago
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    i can try..its basically counting the sign changes in coefficients For f(x) the number of sign changes represents the max number of positive zeros lets say this is n. Then the possible positive zeros are n, n-2, n-4 ... until you get to 0 For f(-x) the number of sign changes represents the max number of negative zeros lets say this is m. Then the possible positive zeros are m, m-2, m-4 ... until you get to 0 The degree or highest exponent tells you the total number of zeros a function has any left over zeros must be imaginary, call these i so any combination of n+m+i must equal the degree. sometimes it helps to set up a chart i can do an example if you like

  2. dumbcow
    • 4 years ago
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    make sense? need example ?

  3. anonymous
    • 4 years ago
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    I'm good, thanks!

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