a. Give the order of each matrix.b. If A = [aᵢⱼ] , identify a₃₂ and a₂₃, or explain why identification is not possible.[1−5πe07−6−π−21211−15]\begin{bmatrix} 1 & -5 & \pi & e \\ 0 & 7 & -6 & -\pi \\ -2 & \frac{1}{2} & 11 & -\frac{1}{5} \end{bmatrix}10−2−5721π−611e−π−51

Ch. 6 - Matrices and Determinants

Blitzer8th EditionCollege AlgebraISBN: 9780136970514Not the one you use?Change textbook

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Blitzer 8th Edition

Ch. 6 - Matrices and Determinants

Problem 3

Chapter 7, Problem 3

a. Give the order of each matrix.

b. If A = [aᵢⱼ] , identify a₃₂ and a₂₃, or explain why identification is not possible.
$\begin{bmatrix}\)1 & -5 & $\pi$ & e \\0 & 7 & -6 & -$\pi$ \\-2 & $\frac{1}{2}$ & 11 & -\(\frac{1}{5}\]\end{bmatrix}$

Verified step by step guidance

Step 1: Identify the order of the matrix by counting the number of rows and columns. The matrix has 3 rows and 4 columns, so its order is $3 \times 4$.

Step 2: Understand the notation $A = [a_{ij}]$, where $a_{ij}$ represents the element in the $i^{th}$ row and $j^{th}$ column of matrix $A$.

Step 3: To find $a_{32}$, locate the element in the 3rd row and 2nd column of the matrix. This corresponds to the value $\frac{1}{2}$.

Step 4: To find $a_{23}$, locate the element in the 2nd row and 3rd column of the matrix. This corresponds to the value $-6$.

Step 5: Summarize the findings: The order of the matrix is $3 \times 4$, $a_{32} = \frac{1}{2}$, and $a_{23} = -6$.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Matrix Order

The order of a matrix is defined by the number of its rows and columns, expressed as 'rows × columns'. It helps in identifying the size and structure of the matrix, which is essential for performing operations like addition, multiplication, or finding specific elements.

Matrix Element Notation (a_ij)

In matrix notation, a_ij represents the element located in the i-th row and j-th column of matrix A. Understanding this notation is crucial for identifying or manipulating specific elements within the matrix, such as a_32 (3rd row, 2nd column) or a_23 (2nd row, 3rd column).

Matrix Representation and Interpretation

A matrix is typically enclosed in brackets and contains elements arranged in rows and columns. Interpreting the matrix correctly, including recognizing special values like π or fractions, is important for accurate identification of elements and understanding the matrix's properties.

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Related Practice

Textbook Question

In Exercises 1 - 24, use Gaussian Elimination to find the complete solution to each system of equations, or show that none exists. $\begin{cases}\)5x + 8y - 6z = 14 \\3x + 4y - 2z = 8 $\x$ + 2y - 2z = 3\(\end{cases}$

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Textbook Question

Write the augmented matrix for each system of linear equations.

$\begin{cases}\)2x + y + 2z = 2 \\3x - 5y - z = 4 $\x$ - 2y - 3z = -6\(\end{cases}$

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Textbook Question

Write the augmented matrix for each system of linear equations.

$\begin{cases}\)x - y + z = 8 $\y$ - 12z = -15 $\z$ = 1\(\end{cases}$

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Textbook Question

a. Give the order of each matrix.

b. If $A = [a_{i j}]$ , identify $a sub 32$ and $a sub 23$ , or explain why identification is not possible.

$\begin{bmatrix}\)4 & -7 & 5 \\-6 & 8 & -1\(\end{bmatrix}$

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Textbook Question

Evaluate each determinant in Exercises 1–10.

$\begin{vmatrix}\)-4 & 1 \\5 & 6\(\end{vmatrix}$

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Textbook Question

In Exercises 1 - 24, use Gaussian Elimination to find the complete solution to each system of equations, or show that none exists. $\begin{cases}\)5x + 12y + z = 10 \\2x + 5y + 2z = -1 $\x$ + 2y - 3z = 5\(\end{cases}$

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