For each of the following functions Show whether it is convex, concave, or neither. [A function f is concave if f is convex] a) f(:1:) = 102: :32 b) f(:i:) = 9:4 + 6x2 + 122: om=+ (1) f(x] = 31:12:; 3% 59% For the last problem use the convexity test discussed in class. For all other cases visual inspection is sufcient