Answer
$f(x) =-(x+3)^2+25$
Work Step by Step
Rewrite the given equation of the parabola so that it looks exactly like the general standard vertex form, $ f(x) = a(x-h)^2+k$
$$\begin{aligned}
f(x) &= -(x+3)^2\\
&= -(x+3)^2-0 \ ,\ h = 0\\
\end{aligned}$$ The best eyeball fit to the data can be found by setting the constant $h= 25$. Hence, we have $f(x) =-(x+3)^2+25 $ as the best eyeball fit to the data.
