3 -20 Let A = -2 3 0 0 0 5 (a) Find an invertible matrix P and a diagonal matrix D such that that P-AP = D. (b) Find P-1. (c) Use your answers to parts (a) and (b) to compute A². [Note that if you compute A² by computing the product A- A, then you will get zero marks to (c)]

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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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### Linear Algebra Exercise: Matrix Diagonalization

Let \( A = \begin{pmatrix}
3 & -2 & 0 \\
-2 & 3 & 0 \\
0 & 0 & 5
\end{pmatrix} \).

#### Exercises:
1. **Find matrices \(P\) and \(D\)**:
   - Identify an invertible matrix \(P\) and a diagonal matrix \(D\) such that \( P^{-1}AP = D \).

2. **Find \(P^{-1}\)**:
   - Compute the inverse of the matrix \(P\), denoted as \(P^{-1}\).

3. **Compute \(A^2\)**:
   - Use your answers from parts (a) and (b) to compute \(A^2\).

   **Note:** If you compute \(A^2\) by directly finding the product \(A \cdot A\), you will get zero marks for part (c).

In the context of linear algebra, this exercise focuses on matrix diagonalization, which simplifies matrix computations and is especially useful for computing matrix powers efficiently.
Transcribed Image Text:### Linear Algebra Exercise: Matrix Diagonalization Let \( A = \begin{pmatrix} 3 & -2 & 0 \\ -2 & 3 & 0 \\ 0 & 0 & 5 \end{pmatrix} \). #### Exercises: 1. **Find matrices \(P\) and \(D\)**: - Identify an invertible matrix \(P\) and a diagonal matrix \(D\) such that \( P^{-1}AP = D \). 2. **Find \(P^{-1}\)**: - Compute the inverse of the matrix \(P\), denoted as \(P^{-1}\). 3. **Compute \(A^2\)**: - Use your answers from parts (a) and (b) to compute \(A^2\). **Note:** If you compute \(A^2\) by directly finding the product \(A \cdot A\), you will get zero marks for part (c). In the context of linear algebra, this exercise focuses on matrix diagonalization, which simplifies matrix computations and is especially useful for computing matrix powers efficiently.
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