Answer
$f(x) =7.2(x-5)^2-9$
Work Step by Step
$$\begin{aligned}
f(x) &= 7.2(x-5)^2-15 \ ,\ h= -15.
\end{aligned}$$ The best eyeball fit to the data can be found by setting the constant $h= -9 $. Hence, we have $f(x) =7.2(x-5)^2-9 $ as the best eyeball fit to the data.
