Question

I need help with this quick pls​

Answer 1

`\left[\begin{array}{cc}21&6\\-2&14\end{array}\right]`

Explanation:

`x=\left[\begin{array}{ccc}8&4\\-2&3\end{array}\right]`

`y=\left[\begin{array}{ccc}5&-2\\2&8\end{array}\right]`

To multiply an array by a constant, all you need to do is take every element in the array and multiply it by the constant, addition is similar in that you just go to each corresponding element in the arrays and add the two corresponding elements together.

`2*\left[\begin{array}{cc}8&4\\-2&3\end{array}\right]+\left[\begin{array}{cc}5&-2\\2&8\end{array}\right] = \left[\begin{array}{cc}21&6\\-2&14\end{array}\right]`