a/q*a*aq=-8 => a=-2
a/q+a+aq=3 => -2/q -2-2q =3 => 3q= -2 -2q -2q^2 => 2q^2 +5q +2=0
q= [-5 + (25-16)^1/2]/4 or [-5 - (25-16)^1/2]/4
q = -2/4 or -2