Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 9 - Quadratic Functions and Equations - 9-6 The Quadratic Formula and the Discriminant - Practice and Problem-Solving Exercises - Page 587: 44

Answer

The error was made on step 3. The third step should be $$= 25 + 48$$ The fourth row should also be changed $$ = 73$$ The error that was made was a multiplication error, where the student forgot to consider the minus.

Work Step by Step

The error was made on step 3. The third step should be $$= 25 + 48$$ The fourth row should also be changed $$ = 73$$ The error that was made was a multiplication error, where the student forgot to consider the minus.
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