Question

Based on Descartes' Rule, the maximum number of positive real zeros f(x) = 4x4 - 13x3 + 25x2 - 54x + 81, could have is
help me please!

Answer 1

4, 2, or 0 because you see how many times the coefficient changes signs when going in descending order.

Answer 2

\[f(x) =4x^4 - 13x^3 + 25x^2 - 54x + 81\]

There are 4 change of sign, hence 4.

Answer 3

4 would be the maximum though

Answer 4

thanks!!