Question

___5 2 1
A=[-2 1 0]
___9 0 2
O determine da matriz A igual a
A)8
B)9
C)10
D)11
E)12
me ajudem​

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)