Perform each operation, if possible. [32−1406][−200231]\left[ \begin{matrix} 3 & 2 & -1 \\ 4 & 0 & 6 \end{matrix} \right] \left[ \begin{matrix} -2 & 0 \\ 0 & 2 \\ 3 & 1 \end{matrix} \right]

Ch. 5 - Systems and Matrices

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Lial 13th Edition

Ch. 5 - Systems and Matrices

문제 79

6장, 문제 79

Perform each operation, if possible.
$[\begin{matrix} 3 & 2 & - 1 \\ 4 & 0 & 6 \end{matrix}] [\begin{matrix} - 2 & 0 \\ 0 & 2 \\ 3 & 1 \end{matrix}]$

검증된 단계별 안내

Identify the dimensions of the two matrices involved. The first matrix is a 3x2 matrix (3 rows and 2 columns), and the second matrix is a 2x3 matrix (2 rows and 3 columns).

Recall the rule for matrix multiplication: the number of columns in the first matrix must equal the number of rows in the second matrix. Here, the first matrix has 2 columns, and the second matrix has 2 rows, so multiplication is possible.

Determine the dimensions of the resulting matrix. The product of a 3x2 matrix and a 2x3 matrix will be a 3x3 matrix (rows of the first matrix by columns of the second matrix).

To find each element of the resulting 3x3 matrix, multiply corresponding elements from the rows of the first matrix by the columns of the second matrix and sum the products. For example, the element in the first row and first column of the product is calculated as: $\text{(row 1 of first matrix)} \cdot \text{(column 1 of second matrix)}$.

Repeat the multiplication and addition process for each element in the 3x3 result matrix until all elements are computed.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Matrix Dimensions and Compatibility

Matrix operations depend on the dimensions of the matrices involved. For multiplication, the number of columns in the first matrix must equal the number of rows in the second. Understanding these dimensions helps determine if the operation is possible.

Matrix Multiplication Process

Matrix multiplication involves taking the dot product of rows from the first matrix with columns from the second. Each element in the resulting matrix is computed by summing the products of corresponding entries, producing a new matrix with dimensions based on the outer dimensions.

Resulting Matrix Dimensions

When multiplying an m×n matrix by an n×p matrix, the resulting matrix has dimensions m×p. This concept helps predict the size of the product matrix and verify the correctness of the operation.

Perform each operation, if possible. [32−1406][−200231]\(\left\)[ \(\begin{matrix}\) 3 & 2 & -1 \\ 4 & 0 & 6 \(\end{matrix}\) \(\right\)] \(\left\)[ \(\begin{matrix}\) -2 & 0 \\ 0 & 2 \\ 3 & 1 \(\end{matrix}\) \(\right\)]