If f(x) = (x + 4)/(x^2 + ax + b), and f(x) has two vertical asymptotes at x = 1 and x = 2, find the sum of a and b.
Vertical asymtopes when denominator = 0
(x-1)(x-2) = x^2 -3x+2 a = -3 b = 2
+36915 
