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Sagot :

VINS

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f  ( 2) = - 1 et  f ( - 1) = 2

( 2  + 1 ) / ( - 1 - 2 ) =  3 / - 3 = -  1

ax  =   - x

f ( 2)  = - 1

2 * -1  + b = -  1

- 2 + b = - 1

b = - 1 + 2 =  1

f (x) = x + 1

d'où  f ( - 1) =  - 1 * - 1 + 1  =  1 + 1 = 2

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