-y^2+2y-5=-(y^2-2y+5)=-(y^2-2y+1+4)=-((y-1)^2+4)=-(y-1)^2-4<0 при любых у
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-y^2+2y-5=-(y^2-2y+5)=-(y^2-2y+1+4)=-((y-1)^2+4)=-(y-1)^2-4<0 при любых у