To complete the square, remember the formula for a square binomial:
The coefficient of the linear term is 2a. In this case:
We can see that the coefficient of the linear term on the left member of the equation is -1. Then:
Add and substract 1/4 to the left member of the equation:
Since the first three terms of the left member correspond to a perfect square trinomial, then we can rewrite it as a square binomial:
Add 1/4 to both sides of the equation:
Take the square root to both sides of the equation:
Therefore, the answer is: