Since one of the roots of sextic equation (1) is a
dependent root, one of the coecients also will be a dependent coecient, and it
will be determined by the remaining coecients. To derive this relation (among the
coecients) consider the equation (11), and substitute the values of b0 and c0 in
(11) using (15) and (19) respectively. We obtain the following expression containing
only the coecients of (1).