Factor and check: x^2 -16x+64=0

x^2 -16x+64=0

(x )(x ) ( -8)( -8)=0

(x-8)(x-8)=0

(x-8)^2 = 0

Check:

(x-8)(x-8)=0

(x)(x) (x)(-8) (-8)(x) (-8)(-8)=0

x^2 -8x -8x +64=0

x^2 -16x +64=0