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4. Consider the function m : R3-> R defined by: m(x) = ax, tax? -621 - 23+ (a - 1) 23, (7) where a E

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4. Consider the function m : R3-> R defined by: m(x) = ax, tax? -621 - 23+ (a - 1) 23, (7) where a E R is a parameter. (a) Determine for what values of a the function is convex, concave, or neither. (b) Find the local and global extreme points when a = 3

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