Question

me ajudem pfv! urgente

Answer 1

Resposta:

a) 23

Explicação passo a passo:

$\left[\begin{array}{ccc}2&2\\-1&2\\\end{array}\right] \cdot\left[\begin{array}{ccc}-2&1\\2&4\\\end{array}\right] = \left[\begin{array}{ccc}2\cdot(-2)+2\cdot2&2\cdot1+2\cdot4\\-1\cdot(-2)+2\cdot2&-1\cdot1+2\cdot4\\\end{array}\right] = \left[\begin{array}{ccc}-4+4&2+8\\2+4&-1+8\\\end{array}\right] =\\ \left[\begin{array}{ccc}0&10\\6&7\\\end{array}\right]$

portanto os elementos são: 0, 10, 6 e 7 e a soma é 10 + 13 = 23