Respostas

2014-08-07T14:09:28-03:00
81x²-9x+9x-1=0
81x²-1=0
x²= - 81/1=-81
2014-08-07T14:28:08-03:00
81X²-9x+9x-1
81X²-1=0
a=81 b= 0 c= -1
Δ= B²-4.a.c
Δ= 0²-4.81. (-1)
Δ= 324