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 ▼ Hal Bitton in Boise Senior Member Posts: 291 Threads: 43 Joined: Jun 2007 10-21-2008, 10:41 AM Hi all, Can't seem to get my 50G to symbolically solve the equation y=(2-x^3)^5 for x. The Ti 89 emulator does it easily, yeilding x=(y^1/5-2)^1/3. Has the HP been trumped in this instance? Best regards, Hal ▼ Kiyoshi Akima Senior Member Posts: 325 Threads: 18 Joined: Jul 2006 10-21-2008, 03:08 PM 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. ▼ V-PN Posting Freak Posts: 785 Threads: 13 Joined: Jan 2005 10-21-2008, 03:13 PM but double XROOTs are impossible for HP: you just have to do what you did: manipulate first. Too bad.. C.Ret Senior Member Posts: 260 Threads: 0 Joined: Oct 2008 10-21-2008, 05:19 PM 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.

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