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_______-1____0_______5__________>x
_ _ _ 0 + + 0 _ _ _0 + +
Odp. x∈(-∞,-1) u (0,5)
x=0
Δ=16+20=36
√Δ=6
x1=5
x2=-1
x∈(-oo,-1,)u(0,5)