(1) x2+7x+12=(x+3)(x+4)x^2 + 7x + 12 = (x+3)(x+4)x2+7x+12=(x+3)(x+4) (2) x2−20x+36=(x−18)(x−2)x^2 - 20x + 36 = (x-18)(x-2)x2−20x+36=(x−18)(x−2) (3) 3p2−13p−10=(3p+2)(p−5)3p^2 - 13p - 10 = (3p+2)(p-5)3p2−13p−10=(3p+2)(p−5) (4) 12a2+5a−2=(4a−1)(3a+2)12a^2 + 5a - 2 = (4a-1)(3a+2)12a2+5a−2=(4a−1)(3a+2) (5) 6t2−7t−3=(3t+1)(2t−3)6t^2 - 7t - 3 = (3t+1)(2t-3)6t2−7t−3=(3t+1)(2t−3) (6) 12a2+21a+9=3(4a2+7a+3)=3(4a+3)(a+1)12a^2 + 21a + 9 = 3(4a^2 + 7a + 3) = 3(4a+3)(a+1)12a2+21a+9=3(4a2+7a+3)=3(4a+3)(a+1)