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Let f(x) =x -4x +16x-16. Find all zeros and discontinuities of f. Make a sign chart and use it to determine x-intercepts and intervals of sign (positive or negative) Find f'(x). Find all zeros and discontinuities of f' (critical numbers). Make a sign chart and use it to determine local extremes, classifying them as maximums or minimums, and find intervals of change [increase or decrease). Find f"(x). Find all zeros and discontinuities of f". Make a sign chart and use it to determine inflection points and intervals of concavity (up or down)