Show that if is an eigenvalue of the 2 2 matrix _ a b c d and either b _= 0 or _= a

Chapter 6, Problem 5

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QUESTION:

Show that if \(\lambda\) is an eigenvalue of the \(2\ \times\ 2\) matrix \(\left[\begin{array}{ll} a & b \\ c & d \end{array}\right]\) and either \(b\ \neq\ 0\ \text{or}\ \lambda\ \neq\ a\), then \(\left[\begin{array}{c} b \\ \lambda-a \end{array}\right]\) is a corresponding eigenvector.

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QUESTION:

Show that if \(\lambda\) is an eigenvalue of the \(2\ \times\ 2\) matrix \(\left[\begin{array}{ll} a & b \\ c & d \end{array}\right]\) and either \(b\ \neq\ 0\ \text{or}\ \lambda\ \neq\ a\), then \(\left[\begin{array}{c} b \\ \lambda-a \end{array}\right]\) is a corresponding eigenvector.

ANSWER:

Step 1 of 3

Show that  is a corresponding eigenvector of the eigenvalue .

It is known that  is a eigenvalue of the matrix .

To find the eigenvector of , consider the matrix .

                                                               

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