Answer
$(n-15)(n-15)$
Work Step by Step
This is a perfect square trinomial, and hence
$$
n^2-30n+225=(n-15)(n-15)
.$$
One can check as follows
$$
(n-15)(n-15)=n^2-15n-15n+225=n^2-30n+225
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 10 - Section 10.5 - Finding Factors of Special Products - Exercise - Page 354: 32
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