Question

À diferença entre o dobro da matriz C e o triplo da matriz D é:

Answer 1

$3. \left[\begin{array}{ccc}-4&8\\-7&13\end{array}\right] -2.\left[\begin{array}{ccc}3&-6\\9&-5\end{array}\right]= \\ \\ \left[\begin{array}{ccc}-12&24\\-21&39\end{array}\right]-\left[\begin{array}{ccc}6&-12\\18&-10\end{array}\right]= \\ \\ \left[\begin{array}{ccc}-6&12\\-3&29\end{array}\right]$

Alternativa (A)