Question

Determine os produtos AB

Answer 1

Explicação passo a passo:

A = $\left[\begin{array}{ccc}4&1\\8&2\\\end{array}\right]$  

B = $\left[\begin{array}{ccc}-3&5\\12&-20\\\end{array}\right]$

AB = $\left[\begin{array}{ccc}(4 .-3)+(1.12)&(4.5)+(1.-20)\\(8.-3)+(2.12)&(8.5)+(2.-20)\\\end{array}\right]$

AB = $\left[\begin{array}{ccc}-12+12&20-20\\-24+24&40-40\\\end{array}\right]$

AB = $\left[\begin{array}{ccc}0&0\\0&0\\\end{array}\right]$