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Sagot :

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bonsoir

f (  1 )=  - 1.5 et  f ( - 2 ) = 4.5

( 4.5 + 1.5 ) / ( - 2 - 1 )  = - 6 /3 = - 2  donc ax  =  - 2 x

f ( 1) = - 1 .5

1 * - 2 + b =  - 1 .5 ⇔  - 2 + b = -  1.5  ⇔ b =  - 1.5 + 2 =  0.5

f (x) = - 2 x + 0.5

f ( - 2 ) = - 2 * - 2 + 0.5 = 4.5

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