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use Descartes' rule of signs to descrive the roots?
h(x) = 4x^4 - 5x^3 + 2x^2 -x +5
please help!! thanks
1 Answer
- Alfredo KrausLv 79 years agoFavorite Answer
The changes of signs between the coefficients are 4 so there can be either 4 positive real roots, 2 positive real roots or zero positive real roots
If you replace x by -x the signs of the coefficients become all positive so there will be no real negative roots
If you really want to know, this equation has no real roots at all (Google Ferrari and solve it)