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b)
Wyznaczam miejsca zerowe iloczynu i ustalam znaki.
x-4=0 v 3-x=0 v 2x+10=0
x=4 v x=3 v x=-5
_____-5_______3____4_________>
+ + 0 _ _ 0 + + 0 _ _ _
Odp. x∈(-5,3) u (4,+∞)