Question

PLS HELP !!!!! matrices multiplication

find -5A + 4B

Answer 1

The value is -5A + 4B is
`\[ \begin{bmatrix} -50 & -9 \\ 8 & -2 \\ -11 & 67 \end{bmatrix} \]`

To find the matrix expression for \(-5A + 4B\), you first need to perform scalar multiplication for each matrix and then subtract them. Given matrices:

`\[ A = \begin{bmatrix} 6 & 1 \\ -4 & -6 \\ 7 & -7 \end{bmatrix} \]`

`\[ B = \begin{bmatrix} -5 & -1 \\ -3 & -8 \\ 6 & 8 \end{bmatrix} \]`

Perform the scalar multiplication:

`\[ -5A = \begin{bmatrix} -30 & -5 \\ 20 & 30 \\ -35 & 35 \end{bmatrix} \]`

`\[ 4B = \begin{bmatrix} -20 & -4 \\ -12 & -32 \\ 24 & 32 \end{bmatrix} \]`

Now, subtract the results:

`\[ -5A + 4B = \begin{bmatrix} -30 & -5 \\ 20 & 30 \\ -35 & 35 \end{bmatrix} + \begin{bmatrix} -20 & -4 \\ -12 & -32 \\ 24 & 32 \end{bmatrix} \]`

`\[ -5A + 4B = \begin{bmatrix} -50 & -9 \\ 8 & -2 \\ -11 & 67 \end{bmatrix} \]`

So,
`\(-5A + 4B\)` in matrix form is:

`\[ \begin{bmatrix} -50 & -9 \\ 8 & -2 \\ -11 & 67 \end{bmatrix} \]`

Complete question:

Find -5A + 4B

A=[6, 1, -4, -6, 7, -7] B=[-5, -1, -3, -8, 6, 8]

a. [-10, 9, 8, -2, 16, 67]

b. -10, 9, 8, -2, -59, -68]

c. [-50, -9, -1, 16, -11, -68]

d. [-50, -9, 8, -2, -11, 67]