Question: 4. (10 points) Consider the utility function u(x, y,z) = x2 + In (yz). Is it concave or quasi- concave on Ri? Show your work

4. (10 points) Consider the utility function u(x,
4. (10 points) Consider the utility function u(x, y,z) = x2 + In (yz). Is it concave or quasi- concave on Ri? Show your work

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