3 2 x + 3*x - 28*x - 60
x^3 + 3*x^2 - 28*x - 1*60
1*(x + 6)*(x + 2)*(x - 5)
((1*(x + 6))*(x + 2))*(x - 5)
-60.0 + x^3 + 3.0*x^2 - 28.0*x
(-5 + x)*(2 + x)*(6 + x)