16. 2x2 + 3x-5 = 0

Using the quadratic formula x = [-b ± √(b^2 - 4ac)] / 2a

x = [-3 ± √(3^2 - 4*2*(-5))] / (2*2)

x = [-3 ± √49] / 4

x = (-3 ± 7) / 4

x1 = 4/4 = 1, x2 = -10/4 = -5/2