if $r = \\begin{bmatrix}3&7\\\\-2&-11\\end{bmatrix}$, what is $4r$?\n$\\begin{bmatrix}7&11\\\\2&-7\\end{bmatr…

if $r = \\begin{bmatrix}3&7\\\\-2&-11\\end{bmatrix}$, what is $4r$?\n$\\begin{bmatrix}7&11\\\\2&-7\\end{bmatrix}$\n$\\begin{bmatrix}12&7\\\\-2&-44\\end{bmatrix}$\n$\\begin{bmatrix}7&28\\\\2&-44\\end{bmatrix}$\n$\\begin{bmatrix}12&28\\\\-8&-44\\end{bmatrix}$

if $r = \\begin{bmatrix}3&7\\\\-2&-11\\end{bmatrix}$, what is $4r$?\n$\\begin{bmatrix}7&11\\\\2&-7\\end{bmatrix}$\n$\\begin{bmatrix}12&7\\\\-2&-44\\end{bmatrix}$\n$\\begin{bmatrix}7&28\\\\2&-44\\end{bmatrix}$\n$\\begin{bmatrix}12&28\\\\-8&-44\\end{bmatrix}$

Answer

Explanation:

Step1: Multiply first - row elements

Multiply each element in the first row of matrix $R$ by 4. $3\times4 = 12$ and $7\times4=28$.

Step2: Multiply second - row elements

Multiply each element in the second row of matrix $R$ by 4. $- 2\times4=-8$ and $-11\times4 = - 44$.

Answer:

$\begin{bmatrix}12&28\-8&-44\end{bmatrix}$