Elementary Linear Algebra 7th Edition

Published by Cengage Learning
ISBN 10: 1-13311-087-8
ISBN 13: 978-1-13311-087-3

Chapter 4 - Vector Spaces - Review Exercises - Page 221: 12

Answer

$v$ can not be a linear combination of $u_1$, $u_2$ and $u_3$.

Work Step by Step

Suppose the following linear combination $$(4,-13,-5,-4)=a(1,-2,1,1)+b(-1,2,3,2)+c(0,-1,-1,-1), \quad a,b,c\in R.$$ Which yields the following system of equations \begin{align*} a-b&=4\\ -2a+2b-c&=-13\\ a+3b-c&=-5\\ a+2b-c&=-4. \end{align*} One can see that the above system is inconsistent and hence $v$ can not be a linear combination of $u_1$, $u_2$ and $u_3$.
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