From Troy: Suppose f & g are both concave upward on (-infinity,infinity). Under what condition on f will the composite function h(x)= f(g(x)) be concave upward? Answered by Walter Whiteley.

From Alex: the question is: on what interval is f(x)=(x^{2})(e^{x})?

ive found the 2nd derivative which is e^{x}(x^{2}+4x+2) and i did the quadratic to get -2-2^{0.5} and -2+2^{0.5}, but i dont know what the interval is. Answered by Harley Weston.

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