x^2=t≥0
t^2+√(t+2014)=2014
√(t+2014)=a; a≥√2014
a^2=t+2014(1)
t^2+a=2014(2)
(1)-(2)
(a-t)(a+t)=-(a-t)
th1
a=t; =>t≥√2014
(2)=>t^2+t-2014=0
∆=1+4.2014
t=(√(1+4.2014)-1)/2
x=±√t
th2
a+t=-1
a=-t-1=>0≤t≤√(2014)-1
t^2-t-2015=0
(tu gq tiep)