Respostas

2013-04-05T17:17:32-03:00

(x-r)+x+(x+r) = -3

 3x = -3

x = -1

 

(x-r).x.(x+r) = 8

(x² - rx)(x +r) = 8

x³ + x²r - x²r - r²x = 8

x³ - r²x = 8

(-1)³ - r².-1 = 8

-1 + r²= 8

r = 3

 

(-4, -1, 2)

5 3 5