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2014-06-26T23:23:03+03:00
F(x)=y
x²+x-2=y
x²+x-2-y=0
Δ(y)≥0
Δ(y)=1-4*(-2-y)=1+8+4y=9+4y
9+4y≥0
y≥-9/4
Imf=(-9/4,+∞)