Voici un exercice niveau seconde. On donne f(x)=2x²-4x-5



1) Montrer que f(x)=2 (x-1)²-7

2) Montrer que f admet un minimum que l'on précisera

3) Tracer la courbe de f

4) Résoudre graphiquement f(x)=0

5) Résoudre Algébriquement f(x)=0

Merci de vos réponses.
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