14. (a) Determine all possible critical point(s) of f(r, y) = 2 +ry+y? 3r ...

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14. (a) Determine all possible critical point(s) of f(r, y) = 2² +ry+y? – 3r – 6y. (b) without using the Second Order Partial Derivatives Test (SOPDT), de termine the nature of the obtained C.P(s). (c) Check your answer in (b) through the (SOPDT). 14. (a) Determine all possible critical point(s) of f(r, y) = 2² +ry+y? – 3r – 6y. (b) without using the Second Order Partial Derivatives Test (SOPDT), de termine the nature of the obtained C.P(s). (c) Check your answer in (b) through the (SOPDT).

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