Réponse :

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f(x) = 4x - 9

Image :

f(-3) = 4 * (-3) - 9 = -12 - 9 = -21

f(0) = 4 * 0 - 9 = 0 - 9 = -9

f(0,5) = 4 * 0,5 - 9 = 2 - 9 = -7

f(-0,25) = 4 * (-0,25) - 9 = -1 - 9 = -10

Antécédent :

f(x) = 3

4x - 9 = 3

4x = 3 + 9

x = 12/4

x = 3

f(x) = 0

4x - 9 = 0

4x = 9

x = 9/4

x = 2,25

f(x) = -1

4x - 9 = -1

4x = -1 + 9

x = 8/4

x = 2

f(x) = 7

4x - 9 = 7

4x = 7 + 9

x = 16/4

x = 4

f(x) = -17

4x - 9 = -17

4x = -17 + 9

x = -8/4

x = -2