Maîtrisez les fonctions dérivées — Quiz Bac Math

Question 1 sur 10 10:00

[{"id":21788,"question":"Quelle est la dérivée de la fonction f(x) = 3x² + 2x - 5 ?","option_a":"A. 6x + 2","option_b":"B. 3x + 2","option_c":"C. 6x² + 2","option_d":"D. 3x² + 2","option_e":"","option_f":"","bonne_reponse":"A","explication":"La dérivée d'une fonction polynôme se calcule terme par terme : f'(x) = 6x + 2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21789,"question":"La dérivée d'une fonction constante est toujours nulle.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Une fonction constante a une dérivée nulle car sa pente est toujours horizontale.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21790,"question":"Quelle est la dérivée de la fonction f(x) = (2x + 1)(x - 3) ?","option_a":"A. 4x - 5","option_b":"B. 2x - 5","option_c":"C. 4x + 1","option_d":"D. 2x + 1","option_e":"","option_f":"","bonne_reponse":"A","explication":"En utilisant la règle du produit : f'(x) = 2(x - 3) + (2x + 1) = 4x - 5.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21791,"question":"Si f'(x) \u003E 0 sur un intervalle, alors la fonction f est croissante sur cet intervalle.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Une dérivée positive indique que la fonction est croissante sur l'intervalle considéré.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21792,"question":"Quelle est la dérivée de la fonction f(x) = 1\/x ?","option_a":"A. -1\/x²","option_b":"B. 1\/x²","option_c":"C. -x","option_d":"D. x","option_e":"","option_f":"","bonne_reponse":"A","explication":"La dérivée de 1\/x est -1\/x², car f(x) = x⁻¹ et f'(x) = -x⁻².","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21793,"question":"La dérivée seconde permet de déterminer la concavité d'une fonction.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Si f''(x) \u003E 0, la fonction est convexe (concavité vers le haut).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21794,"question":"Quelle est la solution de l'équation différentielle y' = 2y ?","option_a":"A. y = Ce^(2x)","option_b":"B. y = 2x + C","option_c":"C. y = Cx²","option_d":"D. y = 2\/Cx","option_e":"","option_f":"","bonne_reponse":"A","explication":"L'équation différentielle y' = 2y a pour solution générale y = Ce^(2x), où C est une constante.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21795,"question":"Si f'(a) = 0 et f''(a) \u003C 0, alors la fonction f admet un maximum local en x = a.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Un point critique avec f''(a) \u003C 0 indique un maximum local.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21796,"question":"Quelle est la dérivée de la fonction f(x) = e^(3x) ?","option_a":"A. 3e^(3x)","option_b":"B. e^(3x)","option_c":"C. 3x e^(3x)","option_d":"D. e^(x)","option_e":"","option_f":"","bonne_reponse":"A","explication":"La dérivée de e^(u(x)) est u'(x)e^(u(x)), donc ici f'(x) = 3e^(3x).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21797,"question":"La dérivée d'une fonction paire est toujours impaire.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Si f est paire (f(-x) = f(x)), alors f' est impaire (f'(-x) = -f'(x)).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]