Answer
$(4-cd)(4+cd)$
Work Step by Step
This is a difference between two squares, and hence
$$16-c^2d^2=(4-cd)(4+cd).$$
One can check as follows
$$
(4-cd)(4+cd)=16-4cd+4cd-c^2d^2=16-c^2d^2
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 10 - Section 10.5 - Finding Factors of Special Products - Exercise - Page 354: 30
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