I need help with A and B

3) Locate the critical points of the following functions, then use the First Derivative Test to identify the local maxs and mins of the function. Identify the absolute max and min, if they exist. a- h(x) = xv4 - x2, on [-2, 2] b - y = 2x5 -5x4 - 10x3 + 4, on [-2, 4]