Question

Calcule os determinantes
A) -5 4 7 -2
B) x y y x
C) x-y - y x x + y
D) 1 2 3 5 9 4 0 8 7
E) 3 4 2 1 5 1 2 3 4
F ) 4 3 2 4 2 3 2 1 0

Answer 1

• Sarrus

a.

-5*-2 -(7 * 4)

10 -28

-18

b.

x² -y²

c.

(x -y)*(x + y) -(x * -y)

x² +xy -xy +xy

x² +xy = x(x +y)

d.

1*9*7+2*4*0+3*5*8-0*9*3-8*4*1-7*5*2 = 81

e.

3*5*4+4*1*2+2*1*3-2*5*2-3*1*3-4*1*4 = 29

f.

4*2*0+3*3*2+2*4*1-2*2*2-1*3*4-0*4*3 = 6