Answer
$(4b-9)(4b+9)$
Work Step by Step
This is a difference between two squares, and hence
$$
16b^2-81=(4b-9)(4b+9)
.$$
One can check as follows
$$
(4b-9)(4b+9)=16b^2-36b+36b-81=16b^2-81
.$$
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: 34
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