Posts: 325

Threads: 18

Joined: Jul 2006

As you, I couldn't get it to go as you wrote it. But then I tried rewriting your original equation as

XROOT(5,y)=2-x^3

and then used ISOL. After about a second it returned

x=XROOT(3,XROOT(5,y)-2)

which matches what you got from the TI.

Posts: 260

Threads: 0

Joined: Oct 2008

Hello,

I have no clue why yours HP-50g don't solve it symbolically !

My old HP-28S have no trouble finding a symbolic solution in a second typing a few key :

2: 'Y=(2-X^3)^5'

1: 'X'

[ISOL]
returns in RAD mode

1: 'EXP(2*pi*i*n2/3)*(2-EXP(2*pi*i*n1/5)*Y^0.200)^0.333'

returns when limiting the results of ISOL and QUAD to the principal domain:

1: '(2-Y^0.200)^0.333'

I have no HP-50g here to check, but I see no reason your HP-50g may not obtain a similar result.

Have you check X and Y variable are global (not already present in the path ?) and any flag or mode.

*Edited: 21 Oct 2008, 5:40 p.m. *