Question

Using the Descartes Rule of Sign count the number of sign changes of f(x) and determine the number of positive real zeros.
1. f(x)=x^3+x^2-10x-24
My answer: because the signs don't change the answer would be: "0 sign changes of f(x), which means f(x) has 0 positive real zeros".

Answer 1

1 sign change, so there is exactly 1 positive real root.

The sign change is from +x^2 to -10x

Answer 2

Thank you Steve for your response. I appreciate it very much.