Respostas

2014-07-02T22:08:37-03:00
A) 0=3x - 6
0+6=3X
6/3=X
2=X

B) 0=x² + 4
Δ=B²-4.A.C
Δ=0²-4.1.4
Δ=-16

C) 0= 2x² + 4x + 2
Δ=B²-4.A.C
Δ=(4)²-4.2.2
Δ=16-16
Δ=0

X1= -B+- 
√Δ / 2.A
X1=-4+-0/2.2
X1= -4/4
X1=-1

2014-07-02T22:09:05-03:00
A)3x+6=0 B) x^(2)+4=0
3x=6 x^(2)=4
x=6/3 x= √(4)
x=2 x=2
C) 2^(2)+4x+2=0
delta= b^(2) - 4ac
delta= 4^(2) - 4.2.2
delta= 16-16
delta=0
finished :)