Which condition is necessary for f(x)=P(x)Q(x)f(x) = \frac{P(x)}{Q(x)}f(x)=Q(x)P(x) to have a vertical asymptote at x=cx=cx=c?
Q(c)=0Q(c) = 0Q(c)=0 and P(c)≠0P(c) \neq 0P(c)=0
Q(c)=0Q(c) = 0Q(c)=0 and P(c)=0P(c) = 0P(c)=0
P(c)=0P(c) = 0P(c)=0 and Q(c)≠0Q(c) \neq 0Q(c)=0
None of the above