3x + 15 _______________ note: 3x^2 + 24x + 45 ≠ 0 3x^2 + 24x + 45 3(x + 5) ________________ (3x + 9) (x + 5)≠ 0 (3x + 9) (x + 5) ________________ restrictions x = -5 (x + 3) x = -3 1 ________ x + 3