Question: 6. (a) Define f : R2 -> R by f(x1, X2) = ax, +bx, +cx1x2+d. For what values a, b, c, d * 0 is

6. (a) Define f : R2 -> R by f(x1, X2) = ax, +bx, +cx1x2+d. For what values a, b, c, d * 0 is the function f concave? (b) Show that the Euclidean norm III1 : R" - R is a convex function

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