Can someone help? Ill mark brainliest. (The faded out symbol is a minus. I don't know why its faded out.)

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

Ineed to know the answer to this algebra question.

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x