Given f(x) = (x-8)⁴(x+8)⁴, f'(x) = 8x(x-8)³(x+8)³, and f''(x) = 8(7x²-64)(x-8)²(x+8)²
find, (show work for full credit):
A. The intervals of increasing and decreasing
B. The intervals of concavity
C. The x-coordinates of any local extrema.
D. The x-coordinates of any inflection points