In regards to the HP 50G program UtilsGCC V.11 by Gjermund Skailand, it
mentions in the documentation of an "advanced mode" when speaking of
the PROOT function as follows.....
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b) Example with "numerical" polynom

[1. *-12.6 72.15 -247.84 567.4575 -909.30918 1040.591233 -850.431318
486.424066 -185.44642 42.41233 -4.408211 ]
PRoot

-> Warning and no roots. Use "advanced mode" and try again.


{[1. *-12.6 72.15 -247.84 567.4575 -909.30918 1040.591233 -850.431318
486.424066 -185.44642 42.41233 -4.408211 ]
1000. 1000. 1000. }
PRoot
{[1.000000 -1.099996]
[1.000000 -2.299988 1.319987]
[1.000000 -2.300004 1.320004]
[1.000000 -2.299998 1.319998]
[1.000000 -2.300008 1.320010]
[1.000000 -2.300005 1.320006] }
[6 5 ] *****..multipicity structure
[1.100000 1.200000] *..Roots

The exact polynom is (x-1.1)^6 * (z-1.2)^5

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What exactly is this "advanced mode" that is spoke of here?? Wht mode
changes does one do to make the PROOT example work??

I tried using and not using the "numeric" mode in the CAS mode choices,
but that has no effect.

Thanks