Question: convert Root Of to conventional form

How I can convert Root Of to conventional form?

Thanks

root_of.mw
 

Q1 := x*(x-delta)*(1-x)*(x+y)-alpha*x*y; Q2 := beta*x*y-Zeta*y*(x+y); SOLL := solve({Q1, Q2}, {x, y})

{x = 0, y = 0}, {x = 1, y = 0}, {x = delta, y = 0}, {x = RootOf(beta*_Z^2+(-beta*delta-beta)*_Z-alpha*Zeta+alpha*beta+delta*beta), y = -RootOf(beta*_Z^2+(-beta*delta-beta)*_Z-alpha*Zeta+alpha*beta+delta*beta)*(Zeta-beta)/Zeta}

(1)

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