Maxima and MinimaMedium
Question
Function f(x), g(x) are defined on [-1, 3] and f″(x) > 0 , g″(x) > 0 for all x ∈ [-1, 3]. then which of the following is always true ?
Options
A.f(x) - g(x) is concave upwards on (-1, 3)
B.f(x) g(x) is concave upwards on (-1, 3)
C.f(x) g(x) does not have a critical point on (-1, 3)
D.f(x) + g(x) is concave upwards on (-1, 3)
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