The critical point of the function f(x, y) = x² – 4xy+ 2y² + 4x + 8y – 1 is: Select one: О а. (4, 6) O b. (0, 4) О с. (6, 0) O d. (6, 4) O e. None of the above

Find fx and fy for f(x, y) = (1 - 2x + y)ex+2y Select one: a. None of these b. fx = c. fx (2 + x - y)ex+2y, fx = (x+y)ex+2y, fy = (1 - 2x - 2y) ex+2y. fy = (3 − 2x + 2y) ex+2y fy = (2x − 4y)e™+2y. fy = (3-4x + 2y)ex+²y. d. fx = (2+ x - 2y)ex+2y e. fx = (-1 - 2x + y)ex+2y, 9 O O