Bonjour,
Résoudre :
((1,5-x)*x)+(2,4*x)=1,08
1.5x-x²+2.4x= 1.08
-x²+3.9x-1.08= 0
Δ = 10.89
Δ > 0 ; 2 solutions .
x1 = (-3.9-√10.89) / -2= 3.6
x2 = (-3.9+√10.89) / -2= 0.3
Tableau de signes
x -∞ 0.3 3.6 +∞
-x²+3.9x-1.08 - Ф + Ф -
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Bonjour,
Résoudre :
((1,5-x)*x)+(2,4*x)=1,08
1.5x-x²+2.4x= 1.08
-x²+3.9x-1.08= 0
Δ = 10.89
Δ > 0 ; 2 solutions .
x1 = (-3.9-√10.89) / -2= 3.6
x2 = (-3.9+√10.89) / -2= 0.3
Tableau de signes
x -∞ 0.3 3.6 +∞
-x²+3.9x-1.08 - Ф + Ф -