Use the Second Derivative Test to find the location of all local extrema in the interval (-23,-7) for the given below.
f(x) = (4(x-7)^(2))/(x+7)
If there is more than one local maxima or local minima, write each value x separated by a comma. If a local maxima or local minima does not occur on the function, enter (O)/() in the appropriate box. Answer should be exact.