25x^2 - 60x + 36 = 0 (5x )(5x ) ( -6)( -6) (5x-6)(5x-6)=(5x-6)^2 check: (5x-6)(5x-6) (5x)(5x) (5x)(-6) (-6)(5x) (-6)(-6) 25x^2 -30x -30x +36 25x^2 -60x +36