Question

determine,se existir,a inversa da matriz

A=3 1
5 2

Answer 1

Olá.

Determinante da matriz inversa é dada por:

$\left[\begin{array}{ccc}3&1&\\5&2\end{array}\right] = \left[\begin{array}{ccc}a&b&\\c&d\end{array}\right] = ad-bc$
Multiplique as diagonais: a.d + b.c
$2.3+1(-5) \\ 2.3-5\\6-5\\1$ 

det(A) = 1