Question: Problem 1. Let f(x, y) = 5x2 + 3y + 2x - 6y + 7. (a) Find the directional derivative at point (1, -1) in

Problem 1. Let f(x, y) = 5x2 + 3y + 2x

Problem 1. Let f(x, y) = 5x2 + 3y + 2x - 6y + 7. (a) Find the directional derivative at point (1, -1) in the direction (Leave your answer as a fraction if needed.) (b) Determine whether f(x, y) is strictly convex or strictly concave

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