Let's write in expanded form: (x -4)2 (x -4)·(x -4) x·x + x·-4 -4x -4·-4 ℹx·x = x2‖x·-4 = -x·4‖-4·-4 = 16 x2 -x·4 -4x + 16 ▷Result: x2 -8x + 16