Answer
The minus sign of the fraction
Work Step by Step
The mistake is the $-$ sign which disappeared in front of the fraction when the value of $b$ is substituted. The correct form is:
$$x=-\frac{-12}{2(3)}=2$$
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
Published by
Big Ideas Learning LLC
ISBN 10:
978-1-60840-838-2
ISBN 13:
978-1-60840-838-2
Chapter 8 - Graphing Quadratic Functions - 8.3 - Graphing f(x) = ax^2 + bx + c - Exercises - Page 436: 19
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