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Questions and Answers
What is the result of applying the row operation $R_1
ightarrow R_1 - R_2$ to the matrix $egin{bmatrix} 4 & 2 \ 1 & 3 \ \ \ \ \ \end{bmatrix}$?
What is the result of applying the row operation $R_1 ightarrow R_1 - R_2$ to the matrix $egin{bmatrix} 4 & 2 \ 1 & 3 \ \ \ \ \ \end{bmatrix}$?
- $egin{bmatrix} 1 & 3 \ 4 & 2 \\ \\ \\ \\ \\ \end{bmatrix}$
- $egin{bmatrix} 3 & -1 \ 1 & 3 \\ \\ \\ \\ \\ \end{bmatrix}$ (correct)
- $egin{bmatrix} 3 & 2 \ 1 & 3 \\ \\ \\ \\ \\ \end{bmatrix}$
- $egin{bmatrix} 4 & 2 \ 1 & 3 \\ \\ \\ \\ \\ \end{bmatrix}$
Applying the operation $R_1
ightarrow R_1 - R_2$ to a matrix always results in a decrease in the first row's values.
Applying the operation $R_1 ightarrow R_1 - R_2$ to a matrix always results in a decrease in the first row's values.
True (A)
What is the upper triangular form of the matrix $egin{bmatrix} 2 & 1 \ 3 & 4 \ \ \ \ \ \end{bmatrix}$?
What is the upper triangular form of the matrix $egin{bmatrix} 2 & 1 \ 3 & 4 \ \ \ \ \ \end{bmatrix}$?
Upper triangular form is $egin{bmatrix} 2 & 1 \ 0 & rac{5}{2} \ \ \ \ \ \end{bmatrix}$
To convert the matrix $egin{bmatrix} 1 & -1 \ 2 & 3 \ \ \ \ \ \end{bmatrix}$ into an identity matrix, one of the transformations should involve making the first row look like ______.
To convert the matrix $egin{bmatrix} 1 & -1 \ 2 & 3 \ \ \ \ \ \end{bmatrix}$ into an identity matrix, one of the transformations should involve making the first row look like ______.
Match the following matrix transformations with their descriptions:
Match the following matrix transformations with their descriptions:
Flashcards
Row/Column Swap
Row/Column Swap
A transformation that swaps two rows or columns of a matrix.
Row/Column Addition
Row/Column Addition
Adding a multiple of one row or column to another row or column. It changes the matrix but preserves its solution set.
Row/Column Multiplication
Row/Column Multiplication
Multiplying a row or column by a non-zero constant. Changes the matrix but does not affect the solution set.
Upper Triangular Matrix
Upper Triangular Matrix
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Identity Matrix
Identity Matrix
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Study Notes
Elementary Transformations on Matrices
- Elementary transformations involve specific operations on rows or columns of a matrix.
- These operations include swapping rows (Rᵢ ↔ Rⱼ), multiplying a row by a constant (kRᵢ), and adding a multiple of a row to another row (Rᵢ → Rᵢ + kRⱼ).
- These transformations can be used to simplify or solve systems of linear equations.
- The effect of a transformation (e.g., R₁ ↔ R₂) on a matrix is shown with its new representation (e.g., A’).
Observing Transformations
- Swapping rows (e.g., R₁ ↔ R₂ ) alters the order of rows in a matrix.
- Multiplying a row by a scalar (e.g., 2C₂) scales the row entries.
- Adding a multiple of a row to another (e.g., R₁ → R₁ - R₂) modifies the values in specific rows.
Combining Transformations
- Several transformations can be combined to achieve desired changes in matrix values.
- For instance, a matrix can be changed to a simpler form—like an upper triangular matrix.
Converting to Upper Triangular Form
- This involves using row transformations to reduce a matrix into a form where all elements below the main diagonal are zero.
- This process is a key step in solving systems of linear equations and determinants.
Converting to Identity Matrix
- An identity matrix is a square matrix with ones along the main diagonal and zeros elsewhere.
- Row transformations can be used to convert matrices to identity matrices, often used to determine inverses or solving for variables.
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Description
This quiz explores the fundamental operations known as elementary transformations on matrices. It covers techniques such as row swapping, scaling, and adding multiples of rows to simplify or solve linear equations. Understanding these operations is crucial for working with matrix representations and solving systems of equations.
