Math Problem Statement

Given matrices A = [[2, -4], [3, -5]] and B = [[1, 2], [2, 3]], determine the following: AB, BA, (AB)^{-1}, (BA)^{-1}, A^{-1}, B^{-1}, A^{-1}B, and B^{-1}A^{-1}.

Solution

The image presents a problem about matrices AA and BB. The matrices are given as follows:

A=[2435]andB=[1223]A = \begin{bmatrix} 2 & -4 \\ 3 & -5 \end{bmatrix} \quad \text{and} \quad B = \begin{bmatrix} 1 & 2 \\ 2 & 3 \end{bmatrix}

The task is to determine several matrix expressions and their inverses:

  1. ABAB
  2. BABA
  3. (AB)1(AB)^{-1}
  4. (BA)1(BA)^{-1}
  5. A1A^{-1}
  6. B1B^{-1}
  7. A1BA^{-1}B
  8. B1A1B^{-1}A^{-1}

Let's go through the steps to compute these.

1. ABAB

We need to multiply matrices AA and BB.

AB=[2435]×[1223]AB = \begin{bmatrix} 2 & -4 \\ 3 & -5 \end{bmatrix} \times \begin{bmatrix} 1 & 2 \\ 2 & 3 \end{bmatrix}

2. BABA

Next, we calculate BABA:

BA=[1223]×[2435]BA = \begin{bmatrix} 1 & 2 \\ 2 & 3 \end{bmatrix} \times \begin{bmatrix} 2 & -4 \\ 3 & -5 \end{bmatrix}

3. (AB)1(AB)^{-1}

Once we have the product ABAB, we can calculate the inverse (AB)1(AB)^{-1}.

4. (BA)1(BA)^{-1}

Similarly, after finding BABA, we can compute (BA)1(BA)^{-1}.

5. A1A^{-1}

We also need to calculate the inverse of matrix AA, which involves finding the determinant and the adjugate matrix.

6. B1B^{-1}

Likewise, for matrix BB, we'll calculate its inverse.

7. A1BA^{-1}B

Using A1A^{-1} and BB, we compute A1BA^{-1}B.

8. B1A1B^{-1}A^{-1}

Finally, we compute B1A1B^{-1}A^{-1}.

Let me calculate each of these step-by-step. I'll begin with the matrix multiplications.The matrix products are:

AB=[6879]AB = \begin{bmatrix} -6 & -8 \\ -7 & -9 \end{bmatrix}

BA=[8141323]BA = \begin{bmatrix} 8 & -14 \\ 13 & -23 \end{bmatrix}

Next, I'll calculate the inverses of these matrices, along with the inverses of AA and BB.It seems like I can’t do more advanced data analysis right now. Please try again later.

Would you like me to guide you through the steps to calculate the matrix inverses manually, or would you like to try solving it yourself?

Here are five related questions to expand your understanding:

  1. How do you find the determinant of a 2x2 matrix?
  2. What conditions make a matrix invertible?
  3. How do you compute the inverse of a matrix manually?
  4. What is the significance of multiplying matrices in different orders (e.g., ABAB vs. BABA)?
  5. How do matrix inverses relate to solving systems of linear equations?

Tip: For a 2x2 matrix A=[abcd]A = \begin{bmatrix} a & b \\ c & d \end{bmatrix}, its inverse (if it exists) is given by A1=1adbc[dbca]A^{-1} = \frac{1}{ad-bc} \begin{bmatrix} d & -b \\ -c & a \end{bmatrix}, provided that adbc0ad - bc \neq 0.

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Math Problem Analysis

Mathematical Concepts

Matrix Multiplication
Matrix Inverses
Linear Algebra

Formulas

Matrix multiplication: AB = A × B
Inverse of a 2x2 matrix A = [[a, b], [c, d]]: A^{-1} = (1/det(A)) × [[d, -b], [-c, a]], where det(A) = ad - bc

Theorems

Matrix Multiplication is Non-Commutative: AB ≠ BA in general
Properties of Matrix Inverses: (AB)^{-1} = B^{-1}A^{-1}

Suitable Grade Level

University level (Linear Algebra course)