Find the absolute maximum and minimum values of the function over the indicated interval, and indicate the x-values at which they occur.\\
$\frac{2}{3}$\\$f(x) = (x+4)^{\frac{2}{3}} - 3$; $[-7,2]$\\The absolute maximum value is $oxed{}$ at $x = oxed{}$ .\\(Round to two decimal places as needed. Use a comma to separate answers as needed.)