Answer
$49x^2-16$
Work Step by Step
The product of the sum and difference of two terms is the square of the first term minus the square of the second term.
$(a + b)(a - b) = a^2 - b^2$
$(7x+4)(7x-4)=(7x)^2-(4)^2=49x^2-16$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 5 - Review - Page 406: 107
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