Question

Determine se existe, as matrizes inversas
a)|4 5|
|3 4|

B) |3 1|
|5 2|

Answer 1

a)

det=4*4-5*3 =16-15 ≠ 0 ==>tem inversa

b)

det=3*2  - 1*5 =6-5  ≠ 0  ==> tem inversa