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x(3x-1)=0 v 5x²+5x+1=0
x=0 v x=1/3 v
Δ=5²-4*5=25-20=5
x=1/10*(-5-√5) v x=(-5+√5)/10
Okreslam znaki:
_______(-5-√5)/10_____(-5+√5)/10_____0___1/3____>
+ + 0 _ _ 0 + + 0 _ 0 + +
Odp. x∈(-∞, (-5-√5)/10> u <(-5+√5)/10, 0> u <1/3, +∞)