4 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 ) = 4x2+ 8xy +5y2+8x+20y-7 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. O 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.) O B. There are no such points Find all of the points (x,y) found earlier at which f(x,y) has neither a relative maximum nor a relative minimum. Select the correct choice below and, if necessary, fill in the answer box to complete your choice O A. The function f(x,y) has neither a relative maximum nor a relative minimum 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 the second-derivative test is inconclusive. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The second-derivative test is inconclusive at Type an ordered pair. Use a comma to separate answers as needed.) O B. There are no such points. of. Pe ucat Click to select your answer(s) PE