O sa rescriem legea intr-o forma mai convenabilă:
x*y=xy-3x-3y+9+3=x(y-3)-3(y-3)+3
x*y=(x-3)(y-3)+3
x*x=(x-3)^2+3
x*x*x=[(x-3)^2+3]*x=[(x-3)^2+3-3](x-3)+3
=(x-3)^2(x-3)+3
=(x-3)^3 + 3
==> x*x*x=(x-3)^3+3
(x-3)^3+3=x
(x-3)^3=x-3 I :(x-3)
(x-3)^2=1
x^2-6x+9=1
x^2-6x+8=0
delta=36-32=4
x1,2=[-b+ sqrt(delta)]/2a
x1,2=(6+ 2)/2
==> x1=8/2=4
==> x2=4/2=2
