Use this calculator to complete the square for any quadratic expression. Enter any valid number , including fractions into the text boxes and our calculator will perform all work, while you type! If you are interested in learning more about completing the square or in practicing common problem types for completing the square, please check out our lesson on this topic.
$ \color{red}{A}x^2 + \color{green}{b}x + \blacksquare $
How To use: Just enter any numbers for A and for B. You can write fractions with slashes such as '1/3' or '1/6'
$ \color{red}{A}x^2 + \color{red}{b}x + \blacksquare $
$$ $$

Further Reading:
 Completing the Square Lesson
 Quadratics