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CamTaekwondo
@CamTaekwondo
May 2019
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[1èreES] Calculer le nombre dérivé de f'(a) où a est donné :
f(x)= -x²+ 4x +7 et a=2
Merci de votre aide.
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danielwenin
Verified answer
Je suppose que tu dois le chercher à partir de la définition.
Sinon f'(x) = -2x + 4 et f'(2) = 0
mais
f'(2) = lim ( -(2+h)² + 4(2+h) + 7 ) - 11)/h = lim (-4 -4h - h² + 8 + 4h -4)/h
h-> 0 h-> 0
f'(2) = lim -h²/h = lim -h = 0
h --> 0 h --> 0
Bonne soirée
1 votes
Thanks 1
danielwenin
oui c'est la définition que j'ai utilisée. j'ai trouvé f(x) par la formule mais tu n'as sans doute pas encore vu.
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Lista de comentários
Verified answer
Je suppose que tu dois le chercher à partir de la définition.Sinon f'(x) = -2x + 4 et f'(2) = 0
mais
f'(2) = lim ( -(2+h)² + 4(2+h) + 7 ) - 11)/h = lim (-4 -4h - h² + 8 + 4h -4)/h
h-> 0 h-> 0
f'(2) = lim -h²/h = lim -h = 0
h --> 0 h --> 0
Bonne soirée