Question 994531
The term to add and subtract is 1.


{{{x^2+2x+92+1-1}}}
{{{x^2+2x+1+92-1}}}
{{{(x+1)^2+92-1}}}
{{{(x+1)^2+91}}}


Use your book to learn more.  


Also study these two lessons to help in learning more or better:


<a href="http://www.algebra.com/my/Completing-the-Square-Using-Pictures.lesson?content_action=show_dev">What is Completing the Square?</a>
http://www.algebra.com/my/Completing-the-Square-Using-Pictures.lesson?content_action=show_dev

,
<a href="http://www.algebra.com/my/Completing-the-Square-to-Solve-General-Quadratic-Equation.lesson?content_action=show_dev">How to solve, but also includes HOW TO COMPLETE THE SQUARE</a>
http://www.algebra.com/my/Completing-the-Square-to-Solve-General-Quadratic-Equation.lesson?content_action=show_dev