x2 + 2x - 16 = 0
x2 + 2x + 15 = 0
x2 + 2x - 12 = 0
x2 + 2x - 8 = 0
D.
x2 + 2x - 8 = 0
From the top of a hill h metres high the angles of depressions of the top and the bottom of a pillar are and respectively.The height (in metres) of the pillar is