[Solution] According to the Descartes rule of signs, how many positive real roots does each of the polynomials have? How many negative roots? f(a)=a^5-4a^2-7
Question: According to the Descartes rule of signs, how many positive real roots does each of the polynomials have? How many negative roots?
- \(f\left( a \right)={{a}^{5}}-4{{a}^{2}}-7\)
- \(f\left( x \right)=3{{x}^{3}}+9{{x}^{2}}+8x\)
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