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sara57sarra
@sara57sarra
January 2021
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Bonsoir,comment prouver qu'une fonction carré est decroissante ou croissante svp ? Un exemple ?
Merci :)
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ProfdeMaths1
Verified answer
Soit f(x)=2x²-3
si a et b sont positifs
a<b implique a²<b²
donc 2a²<2b²
donc 2a²-3<2b²-3
donc f(a)<f(b)
donc
f est croissante sur [0;+∞[
1 votes
Thanks 1
sara57sarra
Merci
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Verified answer
Soit f(x)=2x²-3si a et b sont positifs
a<b implique a²<b²
donc 2a²<2b²
donc 2a²-3<2b²-3
donc f(a)<f(b)
donc f est croissante sur [0;+∞[