Question

Considere as seguintes matrizes:

A= 2 0 6 7 B = 0 4 2 -8 C= -6 9 -7 7 -3 -2 D= -6 4 0 1 1 4 -6 0 6 E= 6 9 -9 -1 0 -4 -6 0 -1

Se for possível, calcule:
a) A.B - B
b) (2Dt - 3Et)t

Answer 1

Resposta:

a)

A= $\left[\begin{array}{ccc}2&0\\6&7\end{array}\right]$

B= $\left[\begin{array}{ccc}0&4\\2&-8\end{array}\right]$

A.B= $\left[\begin{array}{ccc}2.0+0.2&2.4+0.(-8)\\6.0+7.2&6.4+7.(-8)\end{array}\right]$

A.B=$\left[\begin{array}{ccc}0&8\\14&-32\end{array}\right]$

A.B-B=$\left[\begin{array}{ccc}0-6&8-4\\14-2&(-32)-(-24)\end{array}\right]$

A.B-B= $\left[\begin{array}{ccc}0&4\\12&-24\end{array}\right]$