1. The problem is to write the inequality $x < -9$ or $x > -6$ in interval notation. 2. Recall that interval notation expresses sets of numbers as intervals between two endpoints. 3. The inequality $x < -9$ means all numbers less than $-9$, which is $(-\infty, -9)$. 4. The inequality $x > -6$ means all numbers greater than $-6$, which is $(-6, \infty)$. 5. Since the problem uses "or", the solution is the union of these two intervals. 6. Therefore, the interval notation is $$(-\infty, -9) \cup (-6, \infty)$$. This represents all $x$ values less than $-9$ or greater than $-6$.