factor: x^2 - 6x + 9

x^2 - 6x + 9

(x )(x ) ( -3)( -3)

(x-3)(x-3)=(x-3)^2

Check:

(x-3)(x-3)

(x)(x) (x)(-3) (-3)(x) (-3)(-3)

x^2 -3x -3x +9

x^2 -6x +9