Réponse :
bonjour
g (x) = - 3 x + 4
g( 2) = - 6 + 4 = - 2
- 3 x + 4 = 19
- 3 x = 19 - 4
- 3 x = 15
x = - 5
g ( - 3) = 9 + 4 = 13
- 3 x + 4 = 0
- 3 x = - 4
x = 4/3
f (x) = 2 x + 7
f ( - 3 ) = - 6 + 7 = 1
2 x+ 7 = 5
2 x = 5 - 7
2 x = - 2
x = - 1
f ( - 1) = 5
2 x + 7 = - 1
2 x = - 1 - 7
2 x = - 8
x = - 4
f ( - 4 ) = - 1
f (0) = 7
h (x) = 2 x /3 - 4
h ( 3) = 6 /3 - 4 = 2 - 4 = - 2
h ( - 1/2) = - 1/2 * 2/3 - 4 = - 2/6 - 4 = - 2/6 - 24/6 = - 26/6 = - 13/3
2 x /3 - 4 = - 4
2 x /3 = - 4 + 4
2 x /3 = 0
x = 0
h ( 0 ) = - 4
h ( 3/2) = 3/2 * 2/3 - 4 = 6/6 - 4 = - 3
2 x /3 - 4 = 0
2 x /3 = 4
2 x = 12
x = 6
h (6) = 0
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