Answer
The student forgot one negative sign in the numerator.
$x=-3$, not $x=3$ as the student calculated.
Work Step by Step
$-b/2a = -(-6)/2*-1 = 6/-2 = -3$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 9 - Quadratic Functions and Equations - 9-2 Quadratic Functions - Practice and Problem-Solving Exercises - Page 545: 39
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