Are the vectors V₁ = 2 1 1 V₂ = 1₂V3 3 4 1 linearly independent? -9

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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**Are the vectors \( v_1 \), \( v_2 \), \( v_3 \) linearly independent?**

Vectors:
\[ v_1 = \begin{bmatrix}2 \\ 1 \\ -1\end{bmatrix} \]
\[ v_2 = \begin{bmatrix}1 \\ 1 \\ 3\end{bmatrix} \]
\[ v_3 = \begin{bmatrix}4 \\ 1 \\ -9\end{bmatrix} \]

To determine if \( v_1 \), \( v_2 \), and \( v_3 \) are linearly independent, you can form a matrix with these vectors as columns and row reduce it to see if the determinant is non-zero or if the row-reduced echelon form yields a matrix with a pivot in every row. If either of these conditions is true, the vectors are linearly independent; otherwise, they are linearly dependent.

Set up the matrix:
\[ A = \begin{bmatrix}2 & 1 & 4 \\ 1 & 1 & 1 \\ -1 & 3 & -9\end{bmatrix} \]

Row reduce the matrix \( A \) to its echelon form or compute its determinant for further analysis.
Transcribed Image Text:**Are the vectors \( v_1 \), \( v_2 \), \( v_3 \) linearly independent?** Vectors: \[ v_1 = \begin{bmatrix}2 \\ 1 \\ -1\end{bmatrix} \] \[ v_2 = \begin{bmatrix}1 \\ 1 \\ 3\end{bmatrix} \] \[ v_3 = \begin{bmatrix}4 \\ 1 \\ -9\end{bmatrix} \] To determine if \( v_1 \), \( v_2 \), and \( v_3 \) are linearly independent, you can form a matrix with these vectors as columns and row reduce it to see if the determinant is non-zero or if the row-reduced echelon form yields a matrix with a pivot in every row. If either of these conditions is true, the vectors are linearly independent; otherwise, they are linearly dependent. Set up the matrix: \[ A = \begin{bmatrix}2 & 1 & 4 \\ 1 & 1 & 1 \\ -1 & 3 & -9\end{bmatrix} \] Row reduce the matrix \( A \) to its echelon form or compute its determinant for further analysis.
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