Question: 1. [2 marks] Consider the function f : R2 -> R defined by f(x, y) = 23 + 5x y + 3. The directional derivative

1. [2 marks] Consider the function f : R2 -> R defined by f(x, y) = 23 + 5x y + 3. The directional derivative of f at (1, 5) in the direction of the vector (-1, 1) is 27 (A) V2 (B) -27 (C) 27 27 (D) V2 (E) none of (A)-(D)

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