HP Forum Archive 18

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50G symbolic solver Message #1 Posted by Hal Bitton in Boise on 21 Oct 2008, 10:41 a.m. 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

Re: 50G symbolic solver Message #2 Posted by Kiyoshi Akima on 21 Oct 2008, 3:08 p.m., in response to message #1 by Hal Bitton in Boise 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.

Re: 50G symbolic solver Message #3 Posted by V-PN on 21 Oct 2008, 3:13 p.m., in response to message #2 by Kiyoshi Akima but double XROOTs are impossible for HP: you just have to do what you did: manipulate first. Too bad..

Re: 50G symbolic solver Message #4 Posted by C.Ret on 21 Oct 2008, 5:19 p.m., in response to message #1 by Hal Bitton in Boise 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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