Question 867606
Same as {{{9x^2+9x-k=0}}}.

Wanting solutions complex, this is a discriminant problem exercise.
Discriminant is {{{9^2-4*9*(-k)}}}.
{{{9^2-4*9*(-k)<0}}}
{{{81+36k<0}}}
{{{36k<-81}}}
{{{k<-81/36}}}
{{{highlight(k<-2&1/4)}}}