[59/75],[" If all the roots of "z^(3)+az^(2)+bz+c=0" are of unit modulus,then "],[0|a|>3],[qquad |b|<=3]

If all the roots of z^(3)+az^(3)+bz+c=0 are of unit modulus,then

If all the roots of z^3+az^2+bz+c=0 are of unit modulus, then (A) |a|le3 (B) |b|le3 (C) |c|=1 (D) none of these

If al the roots oif z^3+az^2+bz+c=0 are of unit modulus, then (A) |a|le3 (B) |b|le3 (C) |c|=1 (D) none of these

If all the roots of the equation z^(4)+az^(3)+bz^(2)+cz+d=0(a,b,c,d in R) are of unit modulus,then

If all the roots of z^3-az^2+bz+c=0 are of unit modulus, then (A) |3-4i+b|gt8 (B) |c|ge3 (C) |3-4i+a|le8 (D) none of these

For a complex number Z, if all the roots of the equation Z^3 + aZ^2 + bZ + c = 0 are unit modulus, then

For a complex number Z, if all the roots of the equation Z^3 + aZ^2 + bZ + c = 0 are unimodular, then

If a,b,c,d in R and all the three roots of az^(3)+bz^(2)+cZ+d=0 have negative real parts,then

If roots of the equation z^(2)+az+b=0 are purely imaginary then

If a,b,c,d in R and all the three roots of az^3 + bz^2 + cZ + d=0 have negative real parts, then