Perform the indicated elementary row operations.
-(2) $\mathrm { R } _ { 2 }$
$\left[ \begin{array} { r r } 5 & - 4 \ - 3 & - 9 \end{array} \right]$
A)
$\left[ \begin{array} { r r } 10 & - 8 \ - 6 & - 18 \end{array} \right]$
B)
$\left[ \begin{array} { r r } 5 & - 4 \ - 6 & - 18 \end{array} \right]$
C)
$\left[ \begin{array} { l l } 10 & - 8 \ - 3 & - 9 \end{array} \right]$
D)
$\left[ \begin{array} { r r } 5 & - 8 \ - 3 & - 18 \end{array} \right]$

Question

Quizplus · Accepted Answer

The operation (2) $\mathrm { R } _ { 2 }$ means to multiply the second row by 2. This operation does not affect the first row, so the elements in the first row remain 5 and -4. The elements in the second row, -3 and -9, are each multiplied by 2, resulting in -6 and -18, respectively.

Perform the Indicated Elementary Row Operations R2\mathrm { R } _ { 2 }R2​

Perform the Indicated Elementary Row Operations $\mathrm { R } _ { 2 }$