Find all points (x,y) where f(x,y) has a possible relative maximum or minimum. f(x,y) =x2 - 5y? - 10x+20y-8 Using only the first-derivative test for functions of two variables, find all the points that are possibly a relative maximum or a relative minimum. (Type an ordered pair. Type an exact answer. Use a comma to separate answers as needed.) Find all points (x,y) where f(x,y) has a possible relative maximum or minimum. f ( x,y ) = - 2x2 +7xy -6y?+ x+y What are the possible point(s)? (Type an ordered pair. Type an exact answer in simplified form. Use a comma to separate answers as needed.) Find all points (x,y) where f(x,y) has a possible relative maximum or minimum. Then, use the second-derivative test to determine, if possible, the nature of f(x.y) at each of these points, If the second-derivative test is inconclusive, so state. f(x.y) = -4x"+ 5xy - 10y"- 5x + 5y -5 First, find the partial derivatives. of ax Using only the first-derivative test for functions of two variables, find all the points that are possibly a relative maximum or a relative minimum. (Type an ordered pair. Use a comma to separate answers as needed.) Find all of the points (x.y) found earlier at which f(x,y) has a relative minimum. Select the correct choice below and, if necessary. fill in the answer box to complete your choice. A. The relative minimum/minima of f(x,y) occur(s) at (Type an ordered pair. Use a comma to separate answers as needed.) O B. There are no such points. Find all of the points (x,y) found earlier at which f(x,y) has a relative maximum. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The relative maximum/maxima of f(x.y) occur(s) at (Type an ordered pair. Use a comma to separate answers as needed.) OB. There are no such points