Question: (a) Find the gradient of the function at P (b) Find a unit normal vector to the level curve (x, y) = c at P

(a) Find the gradient of the function at P

(b) Find a unit normal vector to the level curve ƒ(x, y) = c at P

(c) Find the tangent line to the level curve ƒ(x, y) = c at P, and (d) sketch the level curve, the unit normal vector, and the tangent line in the xy-plane.

f(x, y) = 9x + 4y c = 40, P(2, -1)

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