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Réponse :

Bonsoir,

Explications étape par étape

1) g(X) = - 20X

a) g(0) = -20 x 0

g(0) = 0

b) g(-4) = -20 x (-4)

g(-4) = 80

c) g(-1.5) = -20 x (-1.5)

g(-1.5) = 30

2) g(X) = -20X

a) -20X = -2

=> X = -2/-20

=> X = 1/10

b) -20X = -4

=> X = -4/-20

=> X = 1/5

c) -20X = -1.5

=> X = -1.5/-20

=> X = 15/200

=> X = 3/40 (ou 0.075)