49 (1 point) Find all relative extrema of f (x) = x + X Relative minima occur at (Enter the coordinates of each relative minimum as an ordered pair. If there is more than one relative minimum, enter a comma-separated list, e.g., "(0,1), (1,5), (6,10)"; if there are no relative minima, enter "none".) Relative maxima occur at (Enter the coordinates of each relative maximum as an ordered pair. If there is more than one relative maximum, enter a comma-separated list, e.g., "(0,1), (1,5), (6,10)"; if there are no relative maxima, enter "none".)