## Algebra 2 (1st Edition)

$1$ million
Our equation is: $4=-x^3+4x^2+x\\0=-x^3+4x^2+x-4=(x-4)\cdot-(x^2-1)=-(x+1)(x-1)(x-4)$ We know that $x\gt0$ and $x\ne4$, thus $x=1$.