Bonjour j'aimerais avoir de l'aide svp !!

F(x) est sous la forme ax²+bx+c , identifier a , b , c puis calculer le discriminant delta et les eventuelles racine de f (x) . determiner ensuite le signe f(x) selon les valeurs de x .

1 . f(x) = x²-5x+4
2 . f(x) = -x²-5x+14
3. f(x) = x²-4x+5

Merci :)
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