Question 813683
one real zero but it is negative.

x = -0.75488

two complex roots
x = 0.87744-0.74486 i
x = 0.87744+0.74486 i
max{-x^3+x^2-1} = -23/27 at x = 2/3
min{-x^3+x^2-1} = -1 at x = 0