# Chapter 8 - Section 8.5 - Quadratic Functions and Their Graphs - Exercise Set: 58

$25$

#### Work Step by Step

To create a perfect square trinomial you take the coefficient of x, divide it by two, and square the results. OR $(\frac{b}{2})^{2}$. In this problem $b=-10$. So $(\frac{-10}{2})^{2}=(-5)^{2}=25$.

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