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Sagot :

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bonsoir

g ( 4) = - 1 et  g ( 5 ) = - 4

( - 4 + 1 ) : ( 5 - 4 ) = - 3  

donc ax  = - 3 x

g ( 4) = - 1

4 * - 3 + b = - 1

- 12 + b = - 1

b = - 1 + 12 = 11

g (x) = - 3 x + 11

d'où  g ( 5) = 5 * - 3 + 11 =  - 15 + 11 = - 4

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