math
f''(x) = 24x^2(x^2-1) + 6(x^2-1)^2
when is the graph of f concave upward?
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Answers
The graph of f is concave upward when f''(x) is positive. In this case, f''(x) is positive when x<1 or x>1, so the graph of f is concave upward on the intervals (-∞,1) and (1,∞).
