Error, (in RootOf) the input range 2 .. 1 is invalid - Maple Help

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Error, (in RootOf) the input range ... is invalid

 Description The RootOf command can accept a root selector as an optional argument. Selectors are meant to specify a particular root of an equation or a subset of the roots. They can also be used for working with several (not necessarily specified) roots of the same polynomial. One of the types of selectors supported is a bounding box defined by two complex numbers a and b. The numbers should be given in the order of the lower-left corner of the box to the upper-right corner of the box (or left and right endpoints, in the case of a real interval), otherwise, an error will be raised. Moreover, if there is no root contained in the range, an error will be raised.

Examples

Example 1

 > $\mathrm{RootOf}\left({x}^{2}-x-1,2..1\right)$

Solution

Provide correct interval to the RootOf command.

 >
 ${\mathrm{RootOf}}{}\left({{\mathrm{_Z}}}^{{2}}{-}{\mathrm{_Z}}{-}{1}{,}{1}{..}{2}\right)$ (2.1)

Example 2

 > $\mathrm{RootOf}\left({x}^{2}-x-1,1+2I..2-I\right)$

Solution

Provide correct interval to the RootOf command.

 > $\mathrm{RootOf}\left({x}^{2}-x-1,1-I..2+2I\right)$
 ${\mathrm{RootOf}}{}\left({{\mathrm{_Z}}}^{{2}}{-}{\mathrm{_Z}}{-}{1}{,}{1}{-}{I}{..}{2}{+}{2}{}{I}\right)$ (2.2)