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Sagot :

PAN59
-x²+5x+4 = -4

soit -x²+5x+8=0

a=-1
b=5
c=8

delta=b²-4ac soit 5²-4*(-1)*8 = 57

x1=-b-racine(delta)/2a = -5-racine(57)/-2 = -1,23
x2=-b+racine(delta)/2a = -5+racine(57)/-2 = -8,77

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