9) The elevation of a hiking trail is modelled by the function M35) = 2x 3 + 3x2 '1735 +12 , where h is the height measured in metres above the sea level and x is the horizontal position from a ranger station measured in kilometres. If x is negative, the position is to the west of the station, if x is positive, the position is to the east. Since the trail extends 4.2 km to the west of the ranger station and 4 km to the east, the model is accurate where x E [ 4-254]. At what distances from the ranger station is the trail above sea level? You may use the grid provided