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Wondering which is the first HP calculator to offer a primary root to y root (x) so as to avoid throwing an error in cases such as 3 root (-8), or producing an imaginary result?

Related…does any HP offer d/dx other than the Prime and HP 50?

(06-10-2022 07:11 PM)lrdheat Wrote: [ -> ]Related…does any HP offer d/dx other than the Prime and HP 50?

All the RPL models, starting with the HP 28C, have offered d/dx.

(06-10-2022 06:40 PM)lrdheat Wrote: [ -> ]Wondering which is the first HP calculator to offer a primary root to y root (x) so as to avoid throwing an error in cases such as 3 root (-8), or producing an imaginary result?

I would say the HP-48SX followed by the HP-32SII which both have a secondary X Root Y function on their keyboard and return -2 for 3 Root (-8).