Find the stationary point of F(I, y, 2) =13.73. on the plane 4x + 5y - 2z = -16, and the value of F at that point. . The stationary point is at (I, y, z) . At the stationary point, F(I, y, 2) =_Find the directional derivative of f(x, y, z) = -9x-z - 14y* at P = (-1, 2, -1) in the direction of (-7, -2, -3). P(-7,-2,-3)(-1,2,-1) = What is the maximum rate of increase of f at P? - (1-'Z'I-IFA