Math Problem Statement

Determine if the given vectors are linearly independent.

u = 

−2

0

−3

,    v = 

−1

−1

4

,    w = 

−4

2

−17

linearly independentlinearly dependent  

Solution

To determine if the given vectors u, v, and w are linearly independent or dependent, we need to check if a linear combination of the vectors:

c1u+c2v+c3w=0c_1 \mathbf{u} + c_2 \mathbf{v} + c_3 \mathbf{w} = \mathbf{0}

has only the trivial solution c1=c2=c3=0c_1 = c_2 = c_3 = 0.

The vectors are:

u=(203),v=(114),w=(4217)\mathbf{u} = \begin{pmatrix} -2 \\ 0 \\ -3 \end{pmatrix}, \quad \mathbf{v} = \begin{pmatrix} -1 \\ -1 \\ 4 \end{pmatrix}, \quad \mathbf{w} = \begin{pmatrix} -4 \\ 2 \\ -17 \end{pmatrix}

This can be tested by forming a matrix AA with u, v, and w as columns, and determining its determinant. If the determinant of the matrix is non-zero, the vectors are linearly independent. If the determinant is zero, they are linearly dependent.

The matrix AA is:

-2 & -1 & -4 \\ 0 & -1 & 2 \\ -3 & 4 & -17 \end{pmatrix}$$ Let's calculate the determinant of this matrix. $$\text{det}(A) = \begin{vmatrix} -2 & -1 & -4 \\ 0 & -1 & 2 \\ -3 & 4 & -17 \end{vmatrix}$$ I will compute the determinant now.The determinant of the matrix $$A$$ is 0. Since the determinant is zero, the vectors **u**, **v**, and **w** are **linearly dependent**. Would you like more details or have any questions? Here are 5 related questions to expand your understanding: 1. What does it mean for vectors to be linearly independent in a geometric context? 2. How would you determine the rank of a matrix formed by linearly dependent vectors? 3. Can vectors in a 3D space ever be linearly independent if there are more than three vectors? 4. How does the determinant help in solving systems of linear equations? 5. What are the implications of linearly dependent vectors in real-world applications? **Tip:** If the determinant of a square matrix is zero, it means the matrix does not have an inverse, and the system of equations it represents does not have a unique solution.

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Math Problem Analysis

Mathematical Concepts

Linear Algebra
Vector Spaces
Linear Independence
Determinants

Formulas

Determinant of a 3x3 matrix
Linear combination of vectors

Theorems

Determinant Theorem
Linear Independence Theorem

Suitable Grade Level

Grades 11-12, Early College