Question: Show if convex or concave f(x1, x2) = x + 3x,x2 + x3; S = R f(x1, x2) = x + x; S =

Show if convex or concave f(x1, x2) = x + 3x,x2 + 

Show if convex or concave f(x1, x2) = x + 3x,x2 + x3; S = R f(x1, x2) = x + x; S = R? %3D %3D

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