Question

Dadas as matrizes

O determinante da matriz B.A é:

Answer 1

$B.A_{11}=-1.1+2.2=-1+4=3$

$B.A_{12}=-1.3+2.4=-3+8=5$

$B.A_{21}=3.1+1.2=3+2=5$

$B.A_{22}=3.3+1.4=9+4=13$

$B.A=\left[\begin{array}{cc}3&5\\5&13\end{array}\right]$

$det(B.A)=3.13-5.5$

$det(B.A)=39-25$

$det(B.A)=14$

Gabarito: letra e)