Error, (in evalf/RootOf) there are multiple values encoded in RootOf(_Z^2-_Z-1, -5 .. 5) - Maple Help

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Multiple Possible Roots in Expression

 Description The error occurs when evalf or convert are passed expressions that possibly contain multiple roots.

Examples

Example 1

 >
 ${e}{:=}{\mathrm{RootOf}}{}\left({{\mathrm{_Z}}}^{{2}}{-}{\mathrm{_Z}}{-}{1}{,}{-}{5}{..}{5}\right)$ (2.1)
 > $\mathrm{evalf}\left(e\right)$

The actual roots of are

Example 2

 >

The actual roots of are