Descarte's Rule of Signs
Category : JEE Main & Advanced
The maximum number of positive real roots of a polynomial equation \[f(x)=0\] is the number of changes of sign from positive to negative and negative to positive in \[f(x)\].
The maximum number of negative real roots of a polynomial equation \[f(x)=0\] is the number of changes of sign from positive to negative and negative to positive in \[f(-x)\].
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