Use the "Completing the Square" Process. 

First, make your 1.
Then, all with the variables on the other side; all the constant on the other side.
(Ex. x²+8x+10 so it would then be: x²+8x+___=10+___)
Then, make the left side a PST by:
♥ Multiply 1/2 to the coefficient of the middle term
♥ Square the answer
♥ Put the answer on the blanks of the given example above.

NOTE: If can be factored, rational ; If cannot, irrational.