Answer
$\left( y-\dfrac {1}{y}\right) \left( y+\dfrac {1}{y}\right) $
Work Step by Step
$y^{2}-y^{-2}=y^{2}-\dfrac {1}{y^{2}}=\left( y-\dfrac {1}{y}\right) \left( y+\dfrac {1}{y}\right) $
Calculus: Early Transcendentals (2nd Edition)
by Briggs, Bill L.; Cochran, Lyle; Gillett, Bernard
Published by
Pearson
ISBN 10:
0321947347
ISBN 13:
978-0-32194-734-5
Appendix A - Appendix A Exercises - Page 1158: 21
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