# Chapter 9 - Quadratic Functions and Equations - 9-1 Quadratic Graphs and Their Properties - Mixed Review - Page 540: 64

$\frac{1}{8}$

#### Work Step by Step

If a=-4, and b=1, in order to evaluate the expression $\frac{-b}{2a}$ all we must do is simply plug in the givens into the expression. $\frac{-b}{2a}$=$\frac{-(1)}{2(-4)}$=$\frac{-1}{-8}$=$\frac{1}{8}$

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