Math Problem Statement

Consider the following matrices: 𝐴=[[-1,-3,1],[-3,-4,-4],[2,2,3]]𝐷=[5,0,2],[3,3,3],[0,-2,1]] Find a matrix 𝐡 such that 𝐴𝐡=𝐷 and a matrix 𝐢 such that 𝐢𝐴=𝐷

Solution

Given two matrices AA and DD, we are tasked to find matrices BB and CC such that:

AB=DandCA=DAB = D \quad \text{and} \quad CA = D

The matrix AA and DD are defined as:

A=[βˆ’1βˆ’31βˆ’3βˆ’4βˆ’4223]A = \begin{bmatrix} -1 & -3 & 1 \\ -3 & -4 & -4 \\ 2 & 2 & 3 \end{bmatrix}

D=[5023330βˆ’21]D = \begin{bmatrix} 5 & 0 & 2 \\ 3 & 3 & 3 \\ 0 & -2 & 1 \end{bmatrix}

We will now solve the two matrix equations separately:

1. Finding matrix BB such that AB=DAB = D:

To find matrix BB, we need to solve the system:

AB=DAB = D

This can be rewritten as:

B=Aβˆ’1DB = A^{-1}D

So, we first need to calculate the inverse of AA, Aβˆ’1A^{-1}, and then multiply it by DD to get matrix BB.

2. Finding matrix CC such that CA=DCA = D:

Similarly, to find matrix CC, we solve the system:

CA=DCA = D

This can be rewritten as:

C=DAβˆ’1C = DA^{-1}

Thus, we need to compute Aβˆ’1A^{-1} once and then use it for both BB and CC.

I will now proceed with calculating Aβˆ’1A^{-1} and then find the matrices BB and CC.### Results:

  1. The inverse of matrix AA is:
-1.333 & 3.667 & 5.333 \\ 0.333 & -1.667 & -2.333 \\ 0.667 & -1.333 & -1.667 \end{bmatrix}$$ 2. The matrix $$B$$ such that $$AB = D$$ is: $$B = \begin{bmatrix} 4.333 & 0.333 & 13.667 \\ -3.333 & -0.333 & -6.667 \\ -0.667 & -0.667 & -4.333 \end{bmatrix}$$ 3. The matrix $$C$$ such that $$CA = D$$ is: $$C = \begin{bmatrix} -5.333 & 15.667 & 23.333 \\ -1.000 & 2.000 & 4.000 \\ 0.000 & 2.000 & 3.000 \end{bmatrix}$$ Would you like more details on how these matrices were calculated or any additional clarifications? --- Here are five related questions for further exploration: 1. How do you calculate the inverse of a 3x3 matrix manually? 2. What are the conditions under which a matrix has an inverse? 3. Can you explain why matrix multiplication is not commutative? 4. What is the geometrical interpretation of matrix multiplication? 5. How do you solve a system of linear equations using matrices? **Tip**: Always check if a matrix is invertible by ensuring its determinant is non-zero!

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Math Problem Analysis

Mathematical Concepts

Linear Algebra
Matrix Multiplication
Inverse of a Matrix

Formulas

Matrix multiplication: AB = D, CA = D
Inverse of a matrix: B = A^-1 D, C = D A^-1

Theorems

Matrix Inversion Theorem
Properties of Matrix Multiplication

Suitable Grade Level

College-level Linear Algebra