Answer
The student violated the distributive property.
Work Step by Step
When you have this problem, you cannot simply multiply 3 by x to get rid of the parenthesis. Rather, you must distribute the three to everything inside of the parenthesis.
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Appendix A - A Exercises - Page A6: 4
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