5. Assume that the following conditions exist fi = 0 2= 0 Does a maximum, minimum, or saddle point exist in each case? a. fi1 > 0 fuif2 - fizf21 < 0 b. fi1 <0 fiif2 - fi2if21 > 0 c. fi1 >0 fufn - f12f1 > 0 d. fi1 < 0 fifn - fizf21 < 0

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Q: f (х, у) — г? + ху + у? — 10 + 10у + 40

A: Explanation of the answer is as follows