Answer
$7a^3b^6+a-1$
Work Step by Step
An equilateral triangle has three sides of the same length.
Perimeter $\div 3 =$ Side length
$\frac{21a^3b^6 + 3a - 3}{3}$
$=7a^3b^6+a-1$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 5 - Review - Page 407: 122
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