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Ocheana
@Ocheana
January 2021
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Bonjour je suis en 1ere S et nous faisons les rappels de début d'année, quelqu'un pourrait m'expliquer le petit 2 de l'exercice 2 svp?
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laurance
X² + 3x -2 = (x +3/2 )² - (3/2)² -2 = ( x +3/2)² - 9/4 - 8/4
=(x+3/2)² - 17/4 = -17/ 4 + (x +3/2)² et comme (x +3/2)² positif alors f(x) >= -17/4
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Ocheana
C'est quoi ce calcul que tu fais au début? ;)
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=(x+3/2)² - 17/4 = -17/ 4 + (x +3/2)² et comme (x +3/2)² positif alors f(x) >= -17/4