Answer
$-6$
Work Step by Step
The product of a binomial sum and a binomial difference is: $(A+B)(A-B)=A^2-B^2$.
Hence here: $(\sqrt7+\sqrt{13})(\sqrt7-\sqrt{13})=(\sqrt7)^2-(\sqrt{13})^2=7-13=-6$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 7 - Review Exercises - Page 577: 61
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