# Chapter 3 - Linear and Quadratic Functions - 3.3 Quadratic Functions and Their Properties - 3.3 Assess Your Understanding - Page 145: 3

$\frac{25}{4}$.

#### Work Step by Step

To complete the square of $x^2+bx$ we must add $\left(\frac{b}{2}\right)^2$. With $b=-5$, then to complete the square, we must add $\left(\frac{5}{2}\right)^2=\frac{25}{4}$.

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