Question

Sendo A= 2 5 -1 3
0 3 0 1
0 0 5 -1
0 0 0 10 calcule o det A-¹

Answer 1

2 5 -1 3

0 3 0 1

0 0 5 -1

0 0 0 10

det A = 2.3.5.10 = 300

det A-1 = 1/300