Work Step by Step
RECALL: (1) The vertex form of a quadratic function is $f(x)=a(x-h)^2+k$ where $(h, k)$ are the coordinates of its vertex. (2) The graph of the quadratic function $f(x) = a(x-h)^2+k$ opens (a) upward when $a \gt 0$, (b) downward when $a \lt0$. The equation $y=-(x+4)^2+2$ can be written as $y=-[x-(-4)]^2+2$. With $a=-1$, then the graph of the function is a parabola that opens downward. This equation is in vertex form with its vertex at $(-4, 2)$. Therefore, the answer is Option D.