bonjour
g (8) = 51.2 ⇔ g (x) = 6.4 x
f ( 10) = 64
6.4 x = - 32
x = - 5
g ( - 5) = - 32
A( 0 ) = 200 et B ( 4 ) = 400
( 400 - 200 ) / ( 4 - 0 ) = 200 /4 = 50
ax = 50 x
A (4 ) = 400
4 * 50 + b = 400
⇔ 200 + b = 400
⇔ b = 400 - 200 = 200
donc f (x) = 50 x + 200
C (0 ) = 40 et D ( 2 ) = 0
( 0 - 40 ) / ( 2 - 0 ) = - 40 /2 = - 20
ax = - 20 x
D (2) = 0
2 * - 20 + b = 0
- 40 + b = 0
b = 40
g (x) = - 20 x + 40
