Differential Equations and Linear Algebra (4th Edition)

Published by Pearson
ISBN 10: 0-32196-467-5
ISBN 13: 978-0-32196-467-0

Chapter 4 - Vector Spaces - 4.7 Change of Basis - Problems - Page 318: 12

Answer

$(2,-3,-1,-1)$

Work Step by Step

We know that $a\begin{bmatrix} 1 & 1\\ 1 & 1 \end{bmatrix}+b\begin{bmatrix} 1 & 1\\ 1 & 0 \end{bmatrix}+c\begin{bmatrix} 1 & 1\\ 0 & 0 \end{bmatrix}+d\begin{bmatrix} 1 & 0\\ 0 & 0 \end{bmatrix}=\begin{bmatrix} -3& -2\\ -1 & 2 \end{bmatrix}$. Thus $\begin{bmatrix} a+b+c+d & a+b+c\\ a+b & a \end{bmatrix}=\begin{bmatrix} -3 & -2\\ -1 & 2 \end{bmatrix}$ Thus $a+b+c+d=-3\\ a+b+c=-2\\ a+b=-1\\ a=2$ Thus $a+b+c+d=-3\\ a+b+c=-2\\ b=-3\\ a=2$ Thus $a=2 \\ b=-3 \\ c=-1\\ c=-1$ Thus the vector is $(2,-3,-1,-1)$.
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