Respostas

2013-10-24T15:36:28-02:00
-4x²+28x=0
a= -4  b= +28  c= 0
delta = (b)²-4.a.c
delta = (28)²-4.-4.0
delta = 784 - 0
delta = 784

x' = -( b) +  \sqrt{delta} / 2.a
x' = - (28) +  \sqrt{784} / 2.-4
x'= -28 + 28 / 2.-4
x' = 0

x" = -( b) -  \sqrt{delta} / 2.a
x" = - (28) -  \sqrt{784} / 2.-4
x" = -28 - 28 / 2.-4
x" = -56 / -8
x" + 7

V: { 0,7 }
2 5 2
2013-10-24T15:40:35-02:00