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Sagot :

AYUDA

bjr

f(x) = -4x + 8

que vaut x pour que f(x) = -9/8 ?

-4x + 8 = -9/8

-4x = -9/8 - 8

-4x = -9/8 - 64/8

-4x = -73/8

x = 73/8 * 1/4

x = 73/32

SKABETIX

Bonjour,

f(x) = -9/8 et f(x) = 8 - 4x

donc : 8 - 4x = -9/8

4x = 8 + 9/8

4x = 64/8 + 9/8

4x = 73/8

x = (73/8)/(4/1)

x = 73/8 × 1/4

x = 73/32

Vérification : f(73/24) = 8 - 4 × (73/32) = -9/8

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