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x = 2 y x = 3
0 = 9+3b+c
0 = 4+2b+c
----------------- restar
0 = 5+b+0
b+5=0
b = -5
c = -4-2b
c = -4-2(-5)
c = 10-4
c = 6
Por tanto
b = -5
c = 6
f(x) = x²-5x+6