Question: Find a, b, c for question 12 (a) Find the gradient of f. (b) Evaluate the gradient at the point P. (c) Find the rate

 Find a, b, c for question 12 (a) Find the gradient

Find a, b, c for question 12

of f. (b) Evaluate the gradient at the point P. (c) Find

(a) Find the gradient of f. (b) Evaluate the gradient at the point P. (c) Find the rate of change of f at P in the direction of the vector u. 8. f(x, y) = x2ey, P(3, 0), u = 5(31 - 4j) 9. f(x, y) = x/y, P(2, 1), u = itsj 10. f(x, y) = x2 In y, P(3, 1), u = - 5 13 1 + 13 j 11. f (x, y, z) = x2 yz - xyz', P(2, - 1, 1), u = 10, 3, -5 12. f ( x, y, z) = yzexyz z, P(0, 1, -1), u = 3 4 12 13, 13 , 13

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