The equation is
.
(Add 4 to each side)
(Add:
)
The perfect square of the given trinomial
.


(Take the square root of each side)
Apply square roots property: If
then
.

Apply addition property of equality: If a = b then
.
(Add 2 to each side)
(Apply additive inverse property:
)
Separate the solutions
.

The solution set is
.