Question

encontre o elemento a21 da matriz
tal que X + A = 2B-C
a) 1
b) 3
c) -8
d) 4
e) 2​

Answer 1

Resposta:

a21 da matrix X= 3

Explicação passo-a-passo:

X+A=2B-C

Agora precisaremos fazer as matrizes.

$2b=\left[\begin{array}{ccc}-4&2\\0&-6\end{array}\right]$

$2b-c=\left[\begin{array}{ccc}-3&4\\3&-6\end{array}\right]\\\\x+a=\left[\begin{array}{ccc}-3&4\\3&-6\end{array}\right]\\\\x=\left[\begin{array}{ccc}-3&4\\3&-6\end{array}\right]-a\\\\x=\left[\begin{array}{ccc}-4&1\\3&-8\end{array}\right]$

a21 da matrix X= 3