9. If at least one of lim f(x) or lim f(x) is either co or -oo, then we say that the line x = a is r-at r-+a a vertical asymptote of f. Let f(x) := x2 - 3x x2 - 9 What are the vertical asymptotes of f? (a) r = 3 (b) x = -3 (c) x = 3 and x = -3 (d) x = 0 (e) none of the above is true 10. Suppose that lim f(x) NIH 1-3 g(x) and lime-+39(x) = -oo, then lim (f (x) - g(x)) = 1-+3 (a) 1 (b) 2 ( c) 0o (d) -00 (e) none of the above is true