Answer
$\dfrac{25}{4}$
Work Step by Step
To complete the square of $x^2+bx$, we must add $(\dfrac{b}{2})^2$.
We can see that $b=-5$. So, to complete the square, we must add
$(\dfrac{b}{2})^2=(\dfrac{-5}{2})^2=\dfrac{25}{4}$.
Therefore, the missing term in the given statement is: $\bf{\dfrac{25}{4}}$.
