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Antgaillard
@Antgaillard
April 2019
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Bonsoir à tous et merci de votre aide pour cette équation.
In (2x-1) + ln (x+3) = -ln(2)
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anylor
In (2x-1) + ln (x+3) = -ln(2)
=> (2x -1) ( x+3) = 1/2
=> 4x² +10 -7 = 0
méthode delta => 2 solutions
mais on retient que la solution positive
x = (V53 -5) /4
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antgaillard
2x x x = 2x^2...
antgaillard
Sinon on peut le faire en faisant (2x-1)(x+3)=-2 ?
antgaillard
Mais en utilisant la méthode delta il faut diviser par 2a donc 8 non ?
antgaillard
ok merci beaucoup
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=> (2x -1) ( x+3) = 1/2
=> 4x² +10 -7 = 0
méthode delta => 2 solutions
mais on retient que la solution positive
x = (V53 -5) /4