Find the limit of the sequence when the nth term is given.  a sub n = 3^n+2/5n

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Find the limit of the sequence when the nth term is given. 

a sub n = 3^n+2/5n

A solution key was given to us and the professor had set it up by dividing by 1/3^2 and multiplying it again by 3^2/1. I don't understand why it was being multiplied by 3^2. 

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