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LeilaLOL
@LeilaLOL
May 2019
2
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BONJOUR CEST URGENT SVP :'( ... , je dois etudier le signe et le variation du trinome 3x²-18x ATTENTION DEFINI SUR ]3;+infinie[ , aidez moi svp je n'arrive pas a faire le tableau de signe, merci je vous en prie.. :'(
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nadiab
Bonsoir,
f(x)= 3x²-18x
f'(x)= 6x-18
6x-18=0
x=18/6=3
tu remplaces x par 3 ds f(x)= -27
tableau de variation
x -∞ 3 +∞
f'(x) - 0 +
f(x) +∞
↓ ↑
-27
1 votes
Thanks 0
pocahontas8
ok autant pour moi alors ...utilise la derivée donc
pocahontas8
de rien bonne continuation alors
pocahontas8
x ] 3 6 + infini
_______]_________ ]__________________
3x² -18x ] - ] +
_______]_________ 0_________________
f(x) ] fleche ] fleche en haut
en bas 0
1 votes
Thanks 0
pocahontas8
desolée pour la qualité de mon tableau
pocahontas8
ben oui on ne doit pas mettre -∞ et on ne lui demande pas l'extremum non ? c'est une collegienne elle ne connait pas encore les derivées
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f(x)= 3x²-18x
f'(x)= 6x-18
6x-18=0
x=18/6=3
tu remplaces x par 3 ds f(x)= -27
tableau de variation
x -∞ 3 +∞
f'(x) - 0 +
f(x) +∞
↓ ↑
-27
_______]_________ ]__________________
3x² -18x ] - ] +
_______]_________ 0_________________
f(x) ] fleche ] fleche en haut
en bas 0