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x=3
x²-x-2
Δ=1+8=9=3²
x'=(-b-√Δ)/2a=-1
x''=(-b+√Δ)/2a=2
rysunek:
http://img7.imageshack.us/img7/8453/74440940.png
x∈(-oo.-1>u<2,3>