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18janvier
@18janvier
April 2019
1
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Étudié le sens de variation de
Un= 2n^2 - n + 1
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Un= 2n^2 - n + 1
Un+1=2(n+1)²-(n+1)+1=2n²+4n+2-n=2n²+3n+2
Un+1-Un=4n+1
pour tout n>=0 4n+1>0
Donc la suite est croissante
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Bonjour, quelqu'un pourrait m'expliquer s'il vous plait? niveau 1eS
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Un+1=2(n+1)²-(n+1)+1=2n²+4n+2-n=2n²+3n+2
Un+1-Un=4n+1
pour tout n>=0 4n+1>0
Donc la suite est croissante