Need help with this problem:( - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: HP Prime (/forum-5.html) +--- Thread: Need help with this problem:( (/thread-21828.html)

Need help with this problem:( - CharlieAlfa - 06-04-2024 04:01 AM Hi... When i try to use solve() to solve a 2 var ecc. its send me a error messagge: The ecuation is: solve((0.6=y*q^2)/(176.4*y),y) and the message is: ["Not implemented, e.g. for multivariate mod/approx polynomials Error: Bad Argument Type"] Please i need to fix it before tomorrow cause i have an exam T.T Thanks RE: Need help with this problem:( - Tonig00 - 06-04-2024 02:14 PM O.6/(176.4 * y) = q^2 / 176.4 y = 0.6 / q^2 In cas, if I understood the problem the prime g2 gives the solution. Maybe you have to "collect()" the result RE: Need help with this problem:( - roadrunner - 06-04-2024 04:49 PM You need to make it into an exact equation like this: solve((6/10) = (y+(q^2/(1764*y/10))),y) the answers are: {((-sqrt(-250*q^2+3969)+63)/210),((sqrt(-250*q^2+3969)+63)/210)} For some reason the CAS couldn't or wouldn't solve it as you wrote it. -road RE: Need help with this problem:( - chromos - 06-04-2024 06:23 PM RE: Need help with this problem:( - Lukas - 06-10-2024 07:44 PM Interesting find... it seems to be a general problem with giac though, not just HP Prime's implementation. Or at least solve(.6 = y+(q^2)/(176.4*y),y) just kills giac 1.9.0 on my computer ("Segmentation fault (core dumped)"), whereas it can handle solve((6/10) = (y+(q^2/(1764*y/10))),y) just fine. RE: Need help with this problem:( - cdmackay - 06-11-2024 03:21 PM Perhaps it's related to CAS storing numbers in binary format, which can't represent all decimals exactly? RE: Need help with this problem:( - Albert Chan - 06-11-2024 03:43 PM I think solve with approximate number switched to fsolve. But q is still symbolic, thus fsolve unable to handle.