Question

me ajudem por favor !
não sei fazer...
obg

Answer 1

$A \left[\begin{array}{ccc}2&-2\\3&1\end{array}\right] . B \left[\begin{array}{ccc}-3&1\\0&5\end{array}\right] = \left[\begin{array}{ccc}-6+0&2-10\\-9+0&3+5\end{array}\right];A.B= \left[\begin{array}{ccc}-6&-8\\-9&8\end{array}\right]$-->$A.B.C = \left[\begin{array}{ccc}-6&-8\\-9&8\end{array}\right] . \left[\begin{array}{ccc}4&1\\-2&1\end{array}\right] = \left[\begin{array}{ccc}-24+16&-6-8\\-36-16&-9+8\end{array}\right] --\ \textgreater$$A.B.C = \left[\begin{array}{ccc}-8&-14\\-52&-1\end{array}\right]$