The answers would seem to be the roots of the quadratic equation formed by the denominator of the equation

G(s)= 395553973339.66 /

s2+1264150.9433962s+395553973339.66

The answers given are p1= -90575.686508642[Hz] and p2 = -110620.18494715[Hz]

However, my solution is different from the above. Can anyone tell me where I am going wrong?