Suppose that xx = 2,500 yy = 5,200 xy = 3,700 and the z-direction shear stresses (zx, zy) are zero, while the z-direction normal stress

Suppose that
σxx = 2,500
σyy = 5,200
τxy = 3,700
and the z-direction shear stresses (τzx, τzy) are zero, while the z-direction normal stress (σzz) is 4,000 psi. Find: the major, intermediate, and minor principal stresses.