problème sur le second degré


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On pose un système de deux équations à deux inconnues. Développons la seconde équation : 17l – l² = 60. Soit, sous une formulation davantage propice à la résolution d'équations du second degré : -l² + 17l – 60 = 0. Le discriminant est égal à ? = 289 – (4 × 60) = 49, soit le carré de 7.

Comment calculer le 2nd degré ?

Définition : Une équation du second degré est une équation de la forme ax2 + bx + c = 0 où a, b et c sont des réels avec a ? 0.
. Une solution de cette équation s'appelle une racine du trinôme ax2 + bx + c .
. Exemple : L'équation 3x2 ? 6x ? 2 = 0 est une équation du second degré.

C'est quoi l'humour du second degré ?

Dans le langage, le second degré consiste à amener à un sens plus subtil que la phrase ne veut le faire croire.
. Il est souvent utilisé dans l'humour noir.

Comment vérifier une fonction du second degré ?

Pour tout x appartenant à R, le signe du polynôme est donc le même que celui de a.
. Le polynôme du second degré n'admet alors aucune racine, il est de signe constant pour tout x de R.
. Pour déterminer le signe de P, on peut calculer P(0) = c.
. L e polynôme est donc du signe de c.










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