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Sagot :

1/ f(x) = 0 <=> x = { - 4,5 ; 1 } <=> x = - 4,5 ou x = 1

   f(x) = -5 <=> x = ∅ (aucune solution possible)

   f(x) = 3 <=> x = - 6

2/ f(x) ≤ 0 <=> x ∈ [- 4,5 ; 1 ]

    f(x) > - 2 <=> x ∈ [ - 8 ; - 3,5 [ ∪ ] 0 ; 3 ]

    f(x) ≤ 1,5 <=> x ∈ [ - 3,75 ; 0,25 ]

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