Question

Calculati determinantul urmatoarei matrice A= begin{pmatrix}n -2 & 1 & 3 n 2 & -1 & 0 n 0 & 0 & 4nend{pmatrix}

Answer 1

A= -2  1    3

     2  -1   0

     0   0  4

d= (-2) x (-1) x 4 + 2 x 0 x 3 + 1 x 0 x 0 - (-1) x 3 x 0- 1 x 2 x 4 - (-2) x 0 x 0

d= 8 +0+0+0-8+0

d=0