Nilai limx→3x3−27x2−9=

lim(x->3)  (x³ -27) / (x² -9)
lim(x->3)  (x- 3)(x² + 3x + 9)/(x-3)(x + 3)
lim(x->3 )  (x² + 3x + 9)/ (x + 3)
x = 3 --> ( 9+9+9)/(3+3) = 27/6