lim(x->2) (4x² + 3x - 1)/(x + 5) = (4*2² + 3*2 - 1)/(2 + 5) = 21/7 = 3
lim(x->3) (x² - 9)/(x² - 2x - 3) = lim(x->3) (x - 3)(x + 3)/((x - 3)(x + 1)) = lim(x->3) (x + 3)/(x + 1) = (3 + 3)/(3 + 1) = 6/4 = 3/2
