Answer
$(a-1)(a+1)(b-2)(b+2)$
Work Step by Step
$(a^{2}-1)b^{2}-4(a^{2}-1)=(a^{2}-1)(b^{2}-4)=(a-1)(a+1)(b-2)(b+2)$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter P, Prerequisites - Section P.6 - Factoring - P.6 Exercises - Page 43: 102
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