Question: In Problem D-12, show that f( x 1 , x 2 , x 3 ) is strictly concave. Problem D-12: Show that the quadratic function

In Problem D-12, show that −f( x1, x2 , x3) is strictly concave.


Problem D-12:

Show that the quadratic functionf(x, x, x3) = 5x + 5x + 4x + 4xx +

is strictly convex.

f(x, x, x3) = 5x + 5x + 4x + 4xx + 2xx3

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