#1**+1 **

I am not actually sure what you are being asked to do.

I would assume it means R2 is replaced by R2- 1/2 R1

in which case the answer would be

\(\begin{bmatrix} 4 && 3 && 0 \\ -6-2 && -3-1.5 && 12-0 \end{bmatrix}=> \begin{bmatrix} 4 && 3 && 0 \\ -8 && -4.5 && 12 \end{bmatrix}\)

.Melody Sep 22, 2019