Respostas

2014-05-27T22:15:46-03:00
Δ= b² - 4 . a . c     Δ= (-1)² - 4 . 6 . (-1)   Δ= 1 + 24    Δ= 25      x= -b +- √Δ  / 2.-1
x= -(-1) +- √25  /  -2       x=1+- 5 / -2      x'=  -3      x''= 2

2014-05-27T22:34:43-03:00
6x²-x-1=0
a=6,b=-1 e c=-1
delta=b²-4.ac
delta= 36 + 24
delta = 60
 agora e so calcular a formula de bascara
x=-b + ou - raiz de delta