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helportugal
@helportugal
January 2021
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urgent si vous plait je suis nul en maths c'est exercice 21. 1 résoudre l'équation 2 déterminer signe de f (x) selon les valeurs de X en présentant les résultats ds un tableau
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noui16brahim
F(x)=-2x²-x+3
Δ=b²-4ac=1²-4(-2)*3=1+24=25
x₁=(-b+√Δ)/2a=(1+5)/-4=-6/4=-3/2
x₂=(-b-√Δ)/2a=(1-5)/-4=1
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helportugal
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Δ=b²-4ac=1²-4(-2)*3=1+24=25
x₁=(-b+√Δ)/2a=(1+5)/-4=-6/4=-3/2
x₂=(-b-√Δ)/2a=(1-5)/-4=1