# Chapter 9 - Quadratic Functions and Equations - 9-2 Quadratic Functions - Practice and Problem-Solving Exercises - Page 545: 39

The student forgot one negative sign in the numerator. $x=-3$, not $x=3$ as the student calculated.

#### Work Step by Step

$-b/2a = -(-6)/2*-1 = 6/-2 = -3$

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