125 - (4x - 3)^2 = 5^3 - (4x - 3)^2125 - (4x - 3)^2 = (5 - (4x - 3))(25 + 5(4x - 3) + (4x - 3)^2)125 - (4x - 3)^2 = (5 - 4x + 3)(25 + 20x - 15 + 16x^2 - 24x + 9)125 - (4x - 3)^2 = (-4x + 8)(16x^2 - 4x + 19)125 - (4x - 3)^2 = -4(4x - 8)(16x^2 - 4x + 19)125 - (4x - 3)^2 = -4(32x^2 - 32x + 64x - 64 + 19)125 - (4x - 3)^2 = -4(32x^2 + 32x - 45)
125 - (4x - 3)^2 = 5^3 - (4x - 3)^2
125 - (4x - 3)^2 = (5 - (4x - 3))(25 + 5(4x - 3) + (4x - 3)^2)
125 - (4x - 3)^2 = (5 - 4x + 3)(25 + 20x - 15 + 16x^2 - 24x + 9)
125 - (4x - 3)^2 = (-4x + 8)(16x^2 - 4x + 19)
125 - (4x - 3)^2 = -4(4x - 8)(16x^2 - 4x + 19)
125 - (4x - 3)^2 = -4(32x^2 - 32x + 64x - 64 + 19)
125 - (4x - 3)^2 = -4(32x^2 + 32x - 45)