Réponses

2014-04-20T18:09:49+02:00
28)

a)  a = 2 et b = -7
b) a = 1 et b = -3
c) a = 0 et b = 5
d) a = 1/4 et b = 0
e) a = 5 et b = -5
f) a = -2/3 et b = 5


29)
1a) f(3) = 5x3-4 = 11

1b) f(x) = -1
5x+4 = -1
5x = -5 
x = -4

1c) f(-2) = 5(-2) - 4 = -14

2a) g(-2) = 2.5(-2)-1 = -6

2b) g(x) = -3.5
2.5x - 1  = -3.5 
2.5x = 2.5
x= 1

2c) g(0) = 2.5 x 0 - 1 = -1