Give the Equations of Any Vertical Asymptotes for the Graphs $$f ( x ) = \frac { 6 x ^ { 3 } + 5 x - 9 } { x ^ { 2 } + 4 x - 21 }$$

Multiple Choice

Give the equations of any vertical asymptotes for the graphs of the rational functions.
- $$f ( x ) = \frac { 6 x ^ { 3 } + 5 x - 9 } { x ^ { 2 } + 4 x - 21 }$$

A) $y = 3 , y = - 7$
B) $x = 3 , x = - 7$
C) $y = 6$
D) $x = - 3 , x = 7$