Respostas

2014-07-03T14:37:29-03:00
Δ = b2 - 4.a.c 
Δ = 42 - 4 . 2 . 2 
Δ = 16 - 4. 2 . 2 
Δ = 0
x' = (-4 + √0)/2.2
x' = -4 / 4
x' = -1
x'' = (-4 - √0)/2.2
x'' = -4 / 4
x'' = -1
S={-1}
2014-07-03T14:46:31-03:00
2X²+4X+2=0 USANDO DELTA E BÁSCARA:
▲= b² -4.a .c
▲=16-16
▲=0

entao:

x= -b +- √▲/ 2.a
x= - 4/4
x= -1