Answer
$(y+11)(y-11)$
Work Step by Step
$y^{2}-121=$
...rewrite $121$ as a square.
$=y^{2}-11^{2}$
...factor using the rule for a difference of two squares.
($a^{2}-b^{2}=(a+b)(a-b),\ a=y,\ b=11$)
$=(y+11)(y-11)$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 8 - Polynomials and Factoring - 8-7 Factoring Special Cases - Practice and Problem-Solving Exercises - Page 527: 26
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