Answer
$(-\infty,-1)$ U $(-1,\infty)$
Work Step by Step
We know that all rational functions are continuous everywhere where they are defined. The $\textbf{j}$ and $\textbf{k}$ components are both polynomials, so they are defined on the whole number line. The $\textbf{i}$ component is only undefined at $x=-1$, hence the answer.
