Hello Ramachandra dear, let the zero of the polynomial be a+i
Plugging (a+ib)^2 - (2-3i)(a+ib) + 10 + 4i = 0
Expanding and collecting real and imaginary parts
{(a^2 - b^2) -(2a+3b) + 10} + i{2 a b +3a -2b + 4} = 0
Equating real and imaginary parts on both sides we have
(a^2 - b^2) -(2a+3b) + 10 = 0
2 a b +3a -2b + 4 = 0
If there be any mathematical technique to solve for a and b then we can get the zero of the given quadratic equation.