Find the Area Under (x+2)²-1: Quadratic Function Analysis

To solve this problem, we'll determine where the function $y = (x+2)^2 - 1$ is decreasing. This function is a parabola of the form $y = (x-h)^2 + k$, with $h = -2$ and $k = -1$.

The vertex of this parabola is at $(-2, -1)$. Since the coefficient of the squared term $(x+2)^2$ is positive, the parabola opens upwards. This tells us that the function decreases to the left of the vertex and increases to the right.

Therefore, the function is decreasing for $x < -2$.

In the context of this multiple-choice question, the decreasing interval corresponds to the choice: $x < -2$.

Thus, the descending region for the function is $x < -2$.