Question

Observe a matriz a seguir.

= [
5 2 1

−2 1 0

9 0 2
]

O determinante da matriz A é igual a

(A) 8

(B) 9

(C) 10

(D) 11

(E) 12​

Answer 1

Olá,

$det(A) = (5 \times 1 \times 2 )+ (2 \times 0 \times 9) + (1 \times ( - 2) \times 0) - ((9 \times 1 \times 1) + (5 \times 0 \times 0) + (2 \times ( - 2) \times 2))$

$det(A) = 10 + 0 + 0 - (9 + 0 - 8)$

$det(A) = 10 - 1$

$det(A) = 9$

Letra B)