Answer
$27x+4.5$
Work Step by Step
We are given $(12x-1.7)+(15x+6.2)=12x-1.7+15x+6.2=27x+7.9$.
However, this last step is an incorrect combination of like terms.
$12x-1.7+15x+6.2=(12x+15x)+(-1.7+6.2)=27x+4.5$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 5 - Section 5.3 - Polynomials and Polynomial Functions - Exercise Set - Page 281: 100
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