bonjour
f ( - 3 ) = 1 et f ( 2 ) = 5
( 5 - 1 ) / ( 2 + 3 )= 4 /5
ax = 4 x / 5
f ( - 3 ) = 1
- 3 * 4/5 + b = 1
- 12/5 + b = 1
b = 1 + 12/5 = 17/5
f (x) = 4 x / 5 + 17/5
d'où f ( 2 ) = 2 * 4/5 + 17/5 = 8/5 + 17/5 = 25/5 = 5
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bonjour
f ( - 3 ) = 1 et f ( 2 ) = 5
( 5 - 1 ) / ( 2 + 3 )= 4 /5
ax = 4 x / 5
f ( - 3 ) = 1
- 3 * 4/5 + b = 1
- 12/5 + b = 1
b = 1 + 12/5 = 17/5
f (x) = 4 x / 5 + 17/5
d'où f ( 2 ) = 2 * 4/5 + 17/5 = 8/5 + 17/5 = 25/5 = 5