Question

Asked Nov 24, 2019

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#9a using Descartes's rule of sign

Step 1

Given equation is,

Step 2

**Descartes Rule for positive roots:** The number of positive real zeroes in a polynomial function *f* (*x*) is the same or less than by an even number as the number of changes in the sign of the coefficients.

**Descartes Rule for negative roots:** The number of negative real roots is the number of sign changes after putting (– *x*) in place of *x *in *f *(*x*), or fewer than it by an even number.

** **

**Descartes Rule for ****imaginary**** roots:** The number of imaginary roots is,

Step 3

Consider, *b* which is not equ...

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