Refer to the attached image to answer #4:

4 Find the local maxima and minima of the following functions and determine whether they are maxima or minima. a ) f (X ) = X4 - 2X2 b ) f (X ) - X3 3 -2X2 + 3X + 2 c) f(X) = 2X3 - 9X2 - 24X - 12