Answer the following questions for the function $$f(x) = \frac{ x^3+ 9 x^2+ 27 x+ 27 }{ x^2+ 6 x - 7 }$$ defined on the interval $[-22,16]$.

a.) Enter the $x$-coordinates of the vertical asymptotes for this function as a comma-separated list. If there are none, enter NONE .

Answer:

b.) $f(x)$ is concave down on the region(s):

Note: Your answer to part b will be a comma-separated list of intervals. Intervals shoud be given in interval notation. If it is not concave down anywhere, enter NONE .