Minta bantuanya dong plisss

Minta bantuanya dong plisss

$text{B}:+:text{C}=[begin{array}{ccc}1&-1\2&0end{array}]:+:[begin{array}{ccc}3&2\-1&1end{array}]$

$boxed{text{B}:+:text{C}=[begin{array}{ccc}4&1\1&1end{array}]}$

$text{A}(text{B}:+:text{C}):=:[begin{array}{ccc}6&-1\4&7end{array}][begin{array}{ccc}4&1\1&1end{array}]$

$text{A}(text{B}:+:text{C}):=:[begin{array}{ccc}(6).(4):+:(-1).(1)&(6).(1):+:(-1).(1)\(4).(4):+:(7).(1)&(4).(1):+:(7).(1)end{array}]$

$boxed{text{A}(text{B}:+:text{C}):=:[begin{array}{ccc}23&5\23&11end{array}]}$

$text{AB}:=:[begin{array}{ccc}6&-1\4&7end{array}][begin{array}{ccc}1&-1\2&0end{array}]$

$text{AB}:=:[begin{array}{ccc}(6).(1):+:(-1).(2)&(6).(-1):+:(-1).(0)\(4).(1):+:(7).(2)&(4).(-1):+:(7).(0)end{array}]$

$boxed{text{AB}:=:[begin{array}{ccc}4&-6\18&-4end{array}]}$

$text{AC}:=:[begin{array}{ccc}6&-1\4&7end{array}][begin{array}{ccc}3&2\-1&1end{array}]$

$text{AC}:=:[begin{array}{ccc}(6).(3):+:(-1).(-1)&(6).(2):+:(-1).(1)\(4).(3):+:(7).(-1)&(4).(2):+:(7).(1)end{array}]$

$boxed{text{AC}:=:[begin{array}{ccc}19&11\5&15end{array}]}$

$text{AB}:+:text{AC}:=:[begin{array}{ccc}4&-6\18&-4end{array}]:+:[begin{array}{ccc}19&11\5&15end{array}]$

$boxed{text{AB}:+:text{AC}:=:[begin{array}{ccc}23&5\23&11end{array}]}$

$boxed{text{A}(text{B}:+:text{C}):=:text{AB}:+:text{AC}}$