Complete the square to re-write the quadratic function in vertex form: y=x^2-3x-3

b=-3
b/2=-1.5x-1.5
=2.25
y=x^2-x+2.25 -2.25-4
y=x^2-x+2.25 -6.25
y=(x−1.5)^2−2.25−3
y=(x-1.5)^2-5.25
y=(x-1.5)^2-5.25