Answer
The product of two irrational numbers is not necessarily irrational.
Work Step by Step
Take for example $\sqrt 2 *\sqrt 2=2$.
Discrete Mathematics and Its Applications, Seventh Edition
by Rosen, Kenneth
Published by
McGraw-Hill Education
ISBN 10:
0073383090
ISBN 13:
978-0-07338-309-5
Chapter 1 - Section 1.7 - Introduction to Proofs - Exercises - Page 91: 11
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