Salut à tous! Je bloque sur l’exercice 5 si qlq pourrait m’aider svp

Réponse :

Explications étape par étape

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S(x) = -3x^2 + 8x - 4

Calculer les images par S de :

x = 0

S(0) = -3 * 0 + 8 * 0 - 4

S(0) = 0 + 0 - 4

S(0) = -4

x = 1

S(1) = -3 * 1^2 + 8 * 1 - 4

S(1) = -3 + 8 - 4

S(1) = 1

x = 1/3

S(1/3) = -3 * (1/3)^2 + 8 * 1/3 - 4

S(1/3) = -3 * 1/9 + 8/3 - 12/3

S(1/3) = -1/3 - 4/3

S(1/3) = -5/3

x = -1/3

S(-1/3) = -3 * (-1/3)^2 + 8 * (-1/3) - 4

S(-1/3) = -3 * 1/9 - 8/3 - 12/3

S(-1/3) = -1/3 - 20/3

S(-1/3) = -21/3

S(-1/3) = -7

x = 4/3

S(4/3) = -3 * (4/3)^2 + 8 * 4/3 - 4

S(4/3) = -3 * 16/9 + 32/3 - 12/3

S(4/3) = -16/3 + 32/3 - 12/3

S(4/3) = -28/3 + 32/3

S(4/3) = 4/3