SOLUTION: Use Descartes' rule of signs to describe the roots of: h(x)=4x^4-5x^3+2x^2-x+5

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Use Descartes' rule of signs to describe the roots of: h(x)=4x^4-5x^3+2x^2-x+5      Log On


   

Question 1010524: Use Descartes' rule of signs to describe the roots of:
h(x)=4x^4-5x^3+2x^2-x+5
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
h(x)=4x^4-5x^3+2x^2-x+5
There are 4 sign changes, so 4,2,0 positive roots.
h(-x)=+/++/+/+ There are no negative roots.
graph%28300%2C200%2C-10%2C10%2C-10%2C100%2C4x%5E4-5x%5E3%2B2x%5E2-x%2B5%29