Answer
$(y-1)^2$
Work Step by Step
Using the factors of $1$, we have $-1$ and $-1$ because $-1-1=-2$ and $(-1)(-1)=1 $
$$
y^2-2y+1=(y-1)(y-1)=(y-1)^2
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 10 - Review - Page 358: 21
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