Question

Calcule os determinantes

a)[-9]

b) [5 4]
[3 4]

c) [3. -1]
[ 2 1]

d) [-4 2]
[5 1]

e) [4 -2]
[-10 5]

f) [3]

g) [-1 5]
[-2 -6]

h) [-6 8]
[4 -4]
​

Answer 1

Calcule os determinantes:

a)[-9]

det = '-9'

___________

b)

[5 4]

[3 4]

d = 5.4-4.3

d = 20-12

d = '8'

___________

c)

[3 -1]

[ 2 1]

d = 3.1 - [ (-1).2]

d = 3+1.2

d = '5'

__________

d)

[-4 2]

[5 1]

d= -4.1-5.2

d = -4-10

d = - 14

____________

e)

[4 -2]

[-10 5]

d = 4.5-[(-2).(-10]

d = 20-(20)

d = 20-20

d = 0

_____________

f) [3]

det = '3'

___________

g) [-1 5]

[-2 -6]

d= -1.(-6) - [5.(-2)]

d = 6+10

d = 16

________

h)

[-6 8]

[4 -4]

det = (-6).(-4) -(8.44)

d = 24-32

d = -8