-a^2+6a-9=-(a-3)^2
12ab-3b^2=-3b*(b-4a)
4x^3-x=0
x*(2x-1)*(2x+1)=0
x1=0
2x-1=0
x=1/2
x2=0.5
2x+1=0
x=-1/2
x3=-0.5
-a^2+6a-9=-(a-3)^2
12ab-3b^2=-3b*(b-4a)
4x^3-x=0
x*(2x-1)*(2x+1)=0
x1=0
2x-1=0
x=1/2
x2=0.5
2x+1=0
x=-1/2
x3=-0.5