bonjour

f (x) = 8 x

f (2) = 8*2 = 16

f ( - 3) = - 3*8 = - 24

f ( 0) = 0

f ( 1/8) = 1/8 * 8 = 8/8 = 1

8 x = - 16

x = - 8

antécédent de - 16 = - 8

8 x  =0

x = 0

8 x = 28

x = 3.5

g(x) = 5 x + 1

g (5) = 25 + 1 = 26

g ( 0) = 1

g ( - 2.1) = 5 * - 2.1 + 1 = -10.5 +1 = - 9.5

g ( 7) = 5*7 + 1 = 36

5 x + 1 = 21

5 x = 21 - 1

5 x = 20

x = 4

5 x + 1 = - 14

5 x = -14 - 1

5 x = - 15

x = - 3

5 x +1 = 0

5 x = - 1

x = - 1/5

h (x) = - 6 x

h ( 0) = 0

h ( - 5 ) = - 5 * - 6 = 30

h ( 1/3) = - 6 *1/3 = - 6/3 = - 2

- 6 x = 24

x = - 4

- 6 x = - 42

x = 7

- 6 x = - 3/4

x = - 3/4 * - 1/6

x = 3/24 = 1/8