Question

Seja a matriz A = (aij)3x4 tal que (imagem anexada) então a22 + a34 é igual a:

Answer 1

$\boxed{A\left(a_{ij}\right)_{3\times4}=\left \{ {{i+j^2,\ \text{se}\ i=j} \atop {2i-3j,\ \text{se}\ i\neq j}} \right. }$

$a_{22}\ \to\ i=j\ \to\ a_{22}=2+2^2=2+4\ \therefore\ \boxed{a_{22}=6}$

$a_{34}\ \to\ i\neq j\ \to\ a_{34}=2(3)-3(4)=6-12\ \therefore\ \boxed{a_{34}=-6}$

$a_{22}+a_{34}=6+(-6)\ \therefore\ \boxed{a_{22}+a_{34}=0}$