January 2021 0 68 Report
Bonsoir, Inéquation : 2x² - 7x + 5 ≤ 0
a = 2
b = -7
c = 5

Δ = 9 ; Δ > 0, donc l'inéquation admet deux racines, notées x1 et x2.

x1 = 5/2
x2 = 1

Factorisation du trinôme 2x² - 7x + 5
= a(x - x1)(x - x2)
= 2(x - 5/2)(x - 1)

On écrit S = {1 ; 5/2} et 1 ≤ x ≤ 5/2 ou d'une autre façon ?
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