Je n'ai rien compris tableau de signe math ! --___--.... Pergunta de ideia deMissNina28

MissNina28 @MissNina28

April 2019 1 56 Report

Je n'ai rien compris tableau de signe math ! --___--

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Firefoux F(x)= x² - 6x + 5 sur [ -1,7 ]

Delta = b² - 4 a c
Delta = (-6)² - 4x1x5
Delta = 36-20 = 16 = 4²

x1 = $\frac{-b - \sqrt{ delta} }{2 a}$
x1 = $\frac{6-4}{2}$
x1 = 1

x2 = $\frac{-b + \sqrt{ delta} }{2 a}$
x2 = $\frac{6+4}{2}$
x2 = 5

Ensuite tu dresse ton tableau :

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