Pollard Greene
05/02/2024 · Elementary School

17 Soit \( f \) la fonction définie par \( f(x)=x-\ln |x| \) et \( (C) \) sa courbe représentative dans un repere orthonormé d'axes \( x^{\prime} O x, y^{\prime} O y \). \( 1^{\circ} \) Étudier les variations de \( f \) et tracer \( (C) \). \( 2^{\circ} \) a) Montrer que, pour tout \( m \), la courbe \( (C) \) coupe la droite \( (D) \) d'équation \( y=x+m \) en deux points \( M_{1} \) et \( M_{2} \). b) Montrer que les tangentes à \( (C) \) aux points \( M_{1} \) et \( M_{2} \) se coupent sur l'axe \( y^{\prime} O y \).

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- La fonction \( f(x) = x - \ln |x| \) a un point de minimum à \( x = 1 \). - Pour tout \( m \), la courbe \( (C) \) coupe la droite \( y = x + m \) en deux points \( M_1 \) et \( M_2 \). - Les tangentes à \( (C) \) aux points \( M_1 \) et \( M_2 \) se coupent sur l'axe \( y' O y \).

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