Math Problem Statement

Write the vector [3, -5, -3] as a linear combination of the vectors [-4, 4, 2], [1, 4, -5], and [-2, -4, 5].

Solution

The problem asks to write the vector [353]\begin{bmatrix} 3 \\ -5 \\ -3 \end{bmatrix} as a linear combination of the given vectors:

[442],[145],[245]\begin{bmatrix} -4 \\ 4 \\ 2 \end{bmatrix}, \quad \begin{bmatrix} 1 \\ 4 \\ -5 \end{bmatrix}, \quad \begin{bmatrix} -2 \\ -4 \\ 5 \end{bmatrix}

This means we need to find scalars c1c_1, c2c_2, and c3c_3 such that:

[353]=c1[442]+c2[145]+c3[245]\begin{bmatrix} 3 \\ -5 \\ -3 \end{bmatrix} = c_1 \begin{bmatrix} -4 \\ 4 \\ 2 \end{bmatrix} + c_2 \begin{bmatrix} 1 \\ 4 \\ -5 \end{bmatrix} + c_3 \begin{bmatrix} -2 \\ -4 \\ 5 \end{bmatrix}

This gives us the following system of linear equations by matching the components of the vectors:

  1. 4c1+c22c3=3-4c_1 + c_2 - 2c_3 = 3
  2. 4c1+4c24c3=54c_1 + 4c_2 - 4c_3 = -5
  3. 2c15c2+5c3=32c_1 - 5c_2 + 5c_3 = -3

Let me solve this system of equations to find c1c_1, c2c_2, and c3c_3.The solution to the system of equations gives the following values for the scalars:

c1=3728,c2=177,c3=3314c_1 = -\frac{37}{28}, \quad c_2 = \frac{17}{7}, \quad c_3 = \frac{33}{14}

Thus, the vector [353]\begin{bmatrix} 3 \\ -5 \\ -3 \end{bmatrix} can be written as a linear combination of the given vectors as:

[353]=3728[442]+177[145]+3314[245]\begin{bmatrix} 3 \\ -5 \\ -3 \end{bmatrix} = -\frac{37}{28} \begin{bmatrix} -4 \\ 4 \\ 2 \end{bmatrix} + \frac{17}{7} \begin{bmatrix} 1 \\ 4 \\ -5 \end{bmatrix} + \frac{33}{14} \begin{bmatrix} -2 \\ -4 \\ 5 \end{bmatrix}

Would you like further details on how this solution was derived, or have any other questions?

Here are 5 related questions:

  1. How do you check if a vector can be written as a linear combination of other vectors?
  2. What is the geometric interpretation of a linear combination of vectors?
  3. How do you solve systems of linear equations using matrices?
  4. What is the rank of a matrix, and how does it relate to linear combinations?
  5. Can the process of finding linear combinations be automated for larger systems?

Tip: When solving systems of linear equations, using matrix methods like Gaussian elimination can be much faster for larger systems.

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Math Problem Analysis

Mathematical Concepts

Linear Algebra
Vector Spaces
Linear Combinations
Systems of Equations

Formulas

c1 * vector1 + c2 * vector2 + c3 * vector3 = target vector

Theorems

Linear Independence
Gaussian Elimination

Suitable Grade Level

Undergraduate (College Level)