Evaluate the given limits using the graph of the function $\displaystyle{ f(x) = {\frac{-1}{\left(x-1\right)\!\left(x-4\right)^{2}}} }$ shown above. See limit

1. $\displaystyle \lim_{x \to 1^-} f(x)$ =
2. $\displaystyle \lim_{x \to 1^+} f(x)$ =
3. $\displaystyle \lim_{x \to 1} f(x)$ =
4. $\displaystyle \lim_{x \to 4^-} f(x)$ =
5. $\displaystyle \lim_{x \to 4^+} f(x)$ =
6. $\displaystyle \lim_{x \to 4} f(x)$ =