Can I solve the given biquadratic equation in terms of sigma. I only need real positive root, if any
6125*_Z^4 + 68644*_Z^3*sigma - 219625*_Z^3 + 255712*_Z^2*sigma - 959250*_Z^2 + 238144*_Z*sigma - 1113500*_Z - 245000
I tried with solve for variable but it does not work.