f(s) = 2s^3+18s^2+5
(need help with the concave upward)
f(s) is increasing for s < -6
f(s) is decreasing for -6 < s < 0
f(s) is increasing for s > 0
f(s) is concave downward for s < -3
f(s) is concave upward for s > ?
The relative maximum is at (-6, 221)
The relative minimum is at (0, 5)
The inflection point is at (-3, 113)

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So I can use any number I choose?

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