bonsoir
f ( 1 ) = 3.5 et f ( - 2.5 ) = 0
( 0 - 3.5 ) / ( - 2.5 - 1 ) = - 3.5 / - 3.5 = 1
ax = x
f ( 1) = 3.5
1 * 1 + b = 3.5 ⇔ b = 3.5 - 1 = 2.5
donc f (x) = x + 2. 5 d'où f ( - 2.5) = - 2.5 + 2.5 = 0
h ( 0 ) = - 2 et h ( - 2 ) = 2
( 2 + 2 ) / ( - 2 - 0 ) = 4/- 2 = - 2 donc ax = - 2 x
h ( - 2 ) = 2
- 2 * - 2 + b = 2 ⇔ b = 2 - 4 = - 2
h (x) = - 2 x - 2
d'où h ( 0 ) = - 2
u ( x) = 2 = fonction constante
allez fais la dernière
