Find the Roots (Zeros) -x^3+5x^2+12

$- x^{3} + 5 x^{2} + 12$

Set $- x^{3} + 5 x^{2} + 12$ equal to $0$ .

$- x^{3} + 5 x^{2} + 12 = 0$

Graph each side of the equation. The solution is the x-value of the point of intersection.

$x \approx 5.41000234$