(1) Let f(r, y) = (x + y)e-=v. a) Determine the quadratic approximation function of f(r, y) at the critical point in the first quadrant. b) Use the quadratic approximation function found in part a) or the second-derivative test to investigate the nature of the same critical point of part a).

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A: Please see the explanation below

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A: This question is related to gradient and it's properties.....