Réponse :

Explications étape par étape

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x - 3 = 0 ou x - 1 = 0

x = 3 ou x = 1

x.........|-inf..............1..............3..............+inf

x-3.....|...........(-).............(-).....o......(+)........

x-1......|............(-)....o......(+)............(+).........

Ineq..|............(+)....o......(-)....o......(+).........

(x - 9)(x - 5) < 0

x - 9 = 0 ou x - 5 = 0

x = 9 ou x = 5

x..........|-inf...........5...........9..............+inf

x-9......|........(-)...........(-).....o......(+)........

x-5......|........(-).....o...(+).............(+)....,...

Ineq...|.........(+)....o...(-).....o......(+)........