Determine the intervals on which the graph of y = f(x) is concave up or concave down, and find the points of inflection. f(x) = 16x² + x4 Provide solutions in the form (*, *). Use the symbol co for infinity, U for combining intervals, and an appropriate type of parenthesis "(", ")", "[", or "]", depending on whether the interval is open or closed. Enter Ø if the interval is empty. Use exact values for all responses. f is concave up when x E Resour f is concave down when x E

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