x2-17x+72 x2 -17x +72 (x )(x ) ( -9)( -8) (x-9)(x-8) Factor: (x-9)(x-8) Check: (x-9)(x-8) (x)(x) (x)(-8) (-9)(x) (-9)(-8) x2 -8x -9x +72 x2 -17x +72