Question

Find -5B.
Please help

Answer 1

`-5B = \begin{bmatrix}-15&10\\ 20&40\end{bmatrix}`

Explanation:

`B=\begin{bmatrix}3&-2\\ -4&-8\end{bmatrix}`

`\Longrightarrow -5B = -5 *\begin{bmatrix}3&-2\\ -4&-8\end{bmatrix}`

`\Longrightarrow -5B = \begin{bmatrix}-5 *3&-5 *-2\\ -5 *-4&-5 *-8\end{bmatrix}`

`\Longrightarrow -5B = \begin{bmatrix}-15&10\\ 20&40\end{bmatrix}`