Question

If A= [-8 -7 ], find -3A? [ 1. 6 ]

Answer 1

`Answer\text{ : }\begin{bmatrix}{24} & {21} & {} \\ {-3} & {-18} & {} \\ {} & {} & {}\end{bmatrix}`

We are given a matrix A

`\begin{gathered} A\text{ = }\begin{bmatrix}{-8} & {-7} & {} \\ {1} & {6} & {} \\ {} & {} & {}\end{bmatrix} \\ To\text{ find -3A, mulitply the matrix by -3} \\ -3A\text{ = -3}\begin{bmatrix}{-8} & {-7} & {} \\ {1} & {6} & {} \\ {} & {} & \end{bmatrix} \\ -3A\text{ = }\begin{bmatrix}{-3\text{ x (-8)}} & {-3\text{ x (-7)}} & {} \\ {-3\text{ x 1}} & {-3\text{ x 6}} & {} \\ {} & {} & {}\end{bmatrix} \\ -3A\text{ = }\begin{bmatrix}{24} & {21} & {} \\ {-3} & {-18} & {} \\ {} & {} & {}\end{bmatrix} \end{gathered}`