The equation is
.
Add
to each side.


Compare the equation with
.
a = 6, b = 3 and c = 6.
a) Now we can find discriminant value
\
(Substitute a = 6, b = 3 and c = 6)



b) The discriminant is positive, so the equation have two rational roots.
\c) Apply quadratic formula: 
(Replace
, a with 6, and b with 3) \ \

(
)
\ \


The solutions are
.
The discriminant value is
and the equation have two complex roots.
The solutions are
.