Respostas

2013-08-21T01:19:06-03:00
F(-1): (-1)² + b(-1) + c = 1
        1 - b + c = 1
          -b+c = 0

f(1): 1² + b(1) + c = -1
       1 + b + c = -1
            b+c = -2   

- b + c = 0
b + c = -2

2c = -2
 c = -1

b + (-1) = -2
b - 1 = -2
b = -2 +1
b = -1

bc = (-1) . (-1)
bc = 1
1 5 1