Respostas

2014-05-08T19:01:53-03:00
Fazer baskhara
delta = b² - 4ac

(-4)² - 4.1.(-12)
16 + 48
64

 x_{1} = 4 + 8/2 = 12/2 = 6
 x_{2} = 4 - 8/2 = -4/2 = -2
2014-05-08T19:11:10-03:00
X² - 4x - 12 = 0 ( A= 1; B= - 4; C= - 12 )

Delta= 4² - 4.1. ( - 12 ) 
Delta= 16 + 48 = 64 

x = - 4 + ou - 8  
             2

x¹ = - 4 + 8 : 2 =  2
x² = - 4 - 8 : 2  =  - 6

S = { 2, -6 }