Question

meeee ajudaaaaa
Calcule os determinantes:
a)x y
x+y x+y

b)3 2 1
5 5 0
2 −3 1 ​

Answer 1

Resposta:

a) [x. y]

[x+y. x+y]

x.x+y - y.x+y = x^2+y - yx+y = x^2+y+y-yx = x^2+2 y-yx

b) [3 2 1]

[5 5 0]

[2 -3 1]

[3 2 1] 3 2]

[5 5 0] 5 5]

[2 - 3 1] 2 -3]

3.5.1 + 2.0.2 + 1.5.-3 - 2.5.1 - 3.0.-3 - 1.5.2

15 + 0 -15 - 10 + 0 - 10

15 - 15 - 10 - 10

0 - 10 - 10

-10 - 10

-20