(6 points each) Let f (1, y) = x² + xy. (a) Compute the gradient vector Vf (1,1). (b) Let u= (3,4). Compute the directio
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(6 points each) Let f (1, y) = x² + xy. (a) Compute the gradient vector Vf (1,1). (b) Let u= (3,4). Compute the directio
(6 points each) Let f (1, y) = x² + xy. (a) Compute the gradient vector Vf (1,1). (b) Let u= (3,4). Compute the directional derivative Duf (1,1). (e) Find an equation of the tangent plane to the graph of f at (1,1,2).
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