a.) (8.5) Consider the function (1, 2 ) = 1 + 2 , 1 > 0, 2 > 0 . Use Theorem II (involving the Hessian matrix) to determine whether this function is concave, strictly concave, convex, weakly convex, or none of these.

a.) (8.5) Consider the function f (x1, x2) = 1/361 + \\sz , x1 > 0, x2 > 0 . Use Theorem H (involving the Hessian matrix) to determine whether this function is concave, strictly concave, convex, weakly convex, or none of these