Question

dadas as matrizes a = [ -1 3, 2 -8] e B = [ 2 -1, 3 0]

determine os itens abaixo:
a) det (A)
b) det (B)
c) det (A + B)
d) det ( A) + det (B)

Answer 1

a)det A= l-1 3l
            l2 -8l

det A= +8-6=2

det B= l2 -1l
            l3 0l
b)det B=0-(-3)=0+3=3

A+B= l-1+2 3-1l
          l2+3  -8+0l
A+B=l1 2l
         l5 -8l
c)det(A+B)=-8-10=-18

d)detA +detB=2+3=5