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Find the intervals on which the graph of f is concave upward, the intervals on which...

Find the intervals on which the graph of f is concave upward, the intervals on which the graph of f is concave downward, and the x, y coordinates of the inflection points. Circle your final answers.

6). f(x) = -x^3 – 3x^2 + 5x – 4

7). f(x) = 3x^4 – 18x^2

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