Added note for step 3

complete-the-square.tex

@@ -144,6 +144,8 @@ Here is the general procedure:
 \item If the value for $a$ is \textit{not} 1, divide both sides of the equation by $a$. (We want the $x^2$ term to be by itself.) 
 \item Move the constant term to the right side of the equation.
 \item Divide $b$ by 2, square it, and add it to both sides of equation. 
+
+(\textbf{Note:} If dividing by 2 results in a fraction, leave it as a square. That is, leave it as $(\frac{5}{2})^2$ rather than doing the math and arriving at $\frac{25}{4}$. This will make step four easier.)
 \item Write the left side as a perfect square.
 \item Take the square root of both sides.
 \item Solve for $x$.