nilai x dari 12x2-13x-14

(4x-7)(3x+2) = 0
4x-7 = 0
4x = 7
x = 7/4
3x+2 = 0
3x = -2
x = -2/3

x = 7/4 atau x = -2/3

x=12×2-13×(-14)
=24-(-182)
=24+182
=206