#### 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: $(\sqrt7+\sqrt{13})(\sqrt7-\sqrt{13})=(\sqrt7)^2-(\sqrt{13})^2=7-13=-6$

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Published by
Pearson

ISBN 10:
0-13417-894-7

ISBN 13:
978-0-13417-894-3

$-6$

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