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concave

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Concavity of f(g) 2001-10-25
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.
Concavity 2000-10-22
From Alex:
the question is: on what interval is f(x)=(x2)(ex)?

ive found the 2nd derivative which is ex(x2+4x+2) and i did the quadratic to get -2-20.5 and -2+20.5, but i dont know what the interval is.
Answered by Harley Weston.

 
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