bounsir !!
g(x) = (3x - 9)((-7x - 5)/9) ≤ 0
(3x - 9)((-7x - 5)/9) = 0
donc (3x - 9) = 0 ou ((-7x - 5)/9) = 0
3x - 9 = 0
3x = 9
x = 9/3 = 3
(-7x - 5)/9 = 0
-7x - 5 = 0
-7x = 5
7x = -5
x = -5/7
x____ -∞_____ -5/7_____3_____⁺∞
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3x - 9_____ - _____- _____+
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-7x - 5_____ + _____- _____-
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g(x)_______- ______+_____-
alors x ∈ ]-∞ , -5/7] ∪ [3 , +∞[
