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
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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.