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Here are four matrices:

{:[A=[[3],[4],[5]]quadB=[[-1,-3],[0,4]]],[C=[[2],[1],[0]]quadD=[[-5,2],[3,-4]]]:}
Which of the following calculations are possible?
Choose all answers that apply:
A 
A+C
B 
B+C
c 
C-A
D 
D-B

Here are four matrices:\newlineA=[345]B=[1amp;30amp;4]C=[210]D=[5amp;23amp;4] \begin{array}{l} \mathbf{A}=\left[\begin{array}{l} 3 \\ 4 \\ 5 \end{array}\right] \quad \mathbf{B}=\left[\begin{array}{cc} -1 & -3 \\ 0 & 4 \end{array}\right] \\ \mathbf{C}=\left[\begin{array}{l} 2 \\ 1 \\ 0 \end{array}\right] \quad \mathbf{D}=\left[\begin{array}{ll} -5 & 2 \\ 3 & -4 \end{array}\right] \end{array} \newlineWhich of the following calculations are possible?\newlineChoose all answers that apply:\newline(A) A+C \mathbf{A}+\mathbf{C} \newline(B) B+C \mathbf{B}+\mathbf{C} \newline(C) CA \mathbf{C}-\mathbf{A} \newline(D) DB \mathbf{D}-\mathbf{B}

Full solution

Q. Here are four matrices:\newlineA=[345]B=[1304]C=[210]D=[5234] \begin{array}{l} \mathbf{A}=\left[\begin{array}{l} 3 \\ 4 \\ 5 \end{array}\right] \quad \mathbf{B}=\left[\begin{array}{cc} -1 & -3 \\ 0 & 4 \end{array}\right] \\ \mathbf{C}=\left[\begin{array}{l} 2 \\ 1 \\ 0 \end{array}\right] \quad \mathbf{D}=\left[\begin{array}{ll} -5 & 2 \\ 3 & -4 \end{array}\right] \end{array} \newlineWhich of the following calculations are possible?\newlineChoose all answers that apply:\newline(A) A+C \mathbf{A}+\mathbf{C} \newline(B) B+C \mathbf{B}+\mathbf{C} \newline(C) CA \mathbf{C}-\mathbf{A} \newline(D) DB \mathbf{D}-\mathbf{B}
  1. Check Matrix Dimensions: Matrix addition and subtraction are only possible when the matrices have the same dimensions. Let's check the dimensions of each matrix.\newlineMatrix A is a 3×13 \times 1 matrix.\newlineMatrix B is a 2×22 \times 2 matrix.\newlineMatrix C is a 3×13 \times 1 matrix.\newlineMatrix D is a 2×22 \times 2 matrix.
  2. Check Matrix Operations: Now let's check each operation to see if it's possible by comparing the dimensions of the matrices involved. \newlineA+CA+C: Both AA and CC are 3×13 \times 1 matrices, so this operation is possible.
  3. Addition of A and C: B+CB+C: BB is a 2×22 \times 2 matrix and CC is a 3×13 \times 1 matrix. Since they have different dimensions, this operation is not possible.
  4. Subtraction of B and C: CAC-A: Both CC and AA are 3×13 \times 1 matrices, so this operation is possible.
  5. Subtraction of CC and AA: DBD-B: Both DD and BB are 2×22 \times 2 matrices, so this operation is possible.

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