Algebra and Trigonometry (6th Edition)
6th Edition
ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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![### Matrix Multiplicative Identity Problem
**Use the following matrix to answer the question:**
\[ A = \begin{bmatrix} 1 & \frac{1}{2} \\ 0 & -2 \end{bmatrix} \]
**What is the multiplicative identity of matrix A?**
a. \[ \begin{bmatrix} 0 & 0 \\ 0 & 0 \end{bmatrix} \]
b. \[ \begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix} \]
c. \[ \begin{bmatrix} -1 & -1 \\ 0 & 2 \end{bmatrix} \]
d. \[ \begin{bmatrix} -2 & -1 \\ 0 & 1 \end{bmatrix} \]
e. \[ \begin{bmatrix} 1 & \frac{1}{2} \\ 0 & -\frac{1}{2} \end{bmatrix} \]
**Explanation:**
In this exercise, you are asked to determine the multiplicative identity that, when multiplied by matrix \( A \), results in the identity matrix \( I \), which is:
\[ I = \begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix} \]
Understanding the concept of the multiplicative identity is crucial in linear algebra for solving systems of equations, among other applications. Consider the choices above and compute the product of matrix \( A \) with each option to determine which satisfies the condition \( A \times I = I \times A = A \).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa19b2cf3-e4ba-4c54-87ea-4b78f08e1dba%2F9f4ce757-1a36-4245-a730-7d26b85de8cf%2Fowxcol_processed.png&w=3840&q=75)
Transcribed Image Text:### Matrix Multiplicative Identity Problem
**Use the following matrix to answer the question:**
\[ A = \begin{bmatrix} 1 & \frac{1}{2} \\ 0 & -2 \end{bmatrix} \]
**What is the multiplicative identity of matrix A?**
a. \[ \begin{bmatrix} 0 & 0 \\ 0 & 0 \end{bmatrix} \]
b. \[ \begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix} \]
c. \[ \begin{bmatrix} -1 & -1 \\ 0 & 2 \end{bmatrix} \]
d. \[ \begin{bmatrix} -2 & -1 \\ 0 & 1 \end{bmatrix} \]
e. \[ \begin{bmatrix} 1 & \frac{1}{2} \\ 0 & -\frac{1}{2} \end{bmatrix} \]
**Explanation:**
In this exercise, you are asked to determine the multiplicative identity that, when multiplied by matrix \( A \), results in the identity matrix \( I \), which is:
\[ I = \begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix} \]
Understanding the concept of the multiplicative identity is crucial in linear algebra for solving systems of equations, among other applications. Consider the choices above and compute the product of matrix \( A \) with each option to determine which satisfies the condition \( A \times I = I \times A = A \).
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