I don't know for some reason this question is confusing me and I can't find an example similar in my text book
domain and range of :
You should be familiar w/ the graph of the parent function $\displaystyle y = \frac{1}{x^2}$. Its domain is the same as for f(x).
... what transformation has occurred to the parent function by subtracting 6 ? How does this affect the range?