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M. zerowe:
x = -1, x = 5
-(-1)² + b *(-1) + c = 0
-5² + 5b + c = 0
-1 - b + c = 0
-25 + 5b = c = 0
-b + c = 1 |*(-1)
5b + c = 25
b - c = -1
5b + c = 25
------------------ (+)
6b = 24 /:6
b = 4
c = 1 + 4
c = 5
Odp. b = 4, c = 5