Discrete Mathematics with Applications 4th Edition

Published by Cengage Learning
ISBN 10: 0-49539-132-8
ISBN 13: 978-0-49539-132-6

Chapter 8 - Relations - Exercise Set 8.4 - Page 497: 26

Answer

gcd( 6664, 765) = 17 The linear combination of 6664 and 765 is : 17 = -7(6664) + 61(765)

Work Step by Step

First, caculate the gcd( 6664, 765 ) 6664 = 765 * 8 + 544 765 = 544*1 + 221 544 = 221*2 + 102 221 = 102*2 + 17 102 = 17 * 6 + 0 Therefore, the gcd( 6664, 765 ) = 17 Then, express 17 as a linear combination of 6664 and 765 using the extended Euclidean algorithm 17 = 221 – 102*2 = 221 – ( 544 – 221 * 2 ) * 2 = 221 – 544 * 2 + 221*4 = 544 * ( -2 ) + 221*5 = 544 * ( -2 ) + ( 765 - 544*1 ) *5 = 544 * ( -2 ) + 765 *5 - 544 *5 = 765 *5 + 544 * ( -7 ) = 765 *5 + ( 6664 - 765 * 8 ) * ( - 7 ) = 6664 * ( - 7 ) + 765 * 61 Therefore, the linear combination of 6664 and 765 is : 17 = -7(6664) + 61(765)
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