Tolong bantu dong kakak^^^

Tolong bantu dong kakak^^^

Hasil dari

A + 3B =

$rm = left[begin{array}{ccc}2&1\0&-1end{array}right] +3left[begin{array}{ccc}-1&1\0&-2end{array}right]$

$rm = left[begin{array}{ccc}2&1\0&-1end{array}right] +left[begin{array}{ccc}-3&3\0&-6end{array}right]$

$rm = left[begin{array}{ccc}-1&4\0&-7end{array}right]$