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Help! Having problems with solve function
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Joined: 23/11/2014(UTC)
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I'm trying to solve this equation: 3t^3-2t+5=0 using the solve function solve(3t^3-2t+5=0,t) but when I type t= to solve it, it doesnt give me an answer, just t= the black box And yes, I am using the Boolean in the equation and in solve so I honestly don't know what's wrong? It won't give me the answers for any solve questions! Please help ASAP! Thanks in advance 
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 Rank: Advanced Member Groups: Registered
Joined: 17/01/2013(UTC) Posts: 296   Location: Khabarovsk, Russia Was thanked: 151 time(s) in 107 post(s)
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Best regards,
Mike Kaganski |
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Rank: Advanced Member Groups: Registered
Joined: 18/09/2014(UTC) Posts: 71  Was thanked: 7 time(s) in 7 post(s)
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Originally Posted by: mikekaganski  Use 3*t, not 3t You are not familiar with Smath. The * is inserted automatically when typing. You (critzker) should use the Maxima plugin, which is part of the portable version. See example below. brotjob attached the following image(s):
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Rank: Advanced Member Groups: Registered
Joined: 17/01/2013(UTC) Posts: 296 Location: Khabarovsk, Russia Was thanked: 151 time(s) in 107 post(s)
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Originally Posted by: brotjob You are not familiar with Smath. The * is inserted automatically when typing. Are you sure? Just try to paste the OP code to SMath, and see that 3t is inserted as is, not like "3*t". The thing you mention only applies to interactive typing. OP hasn't specified the method he used in the first place. If used properly, everything works without maxima: solve((3*t)^3-2*t+5≡0,t)=-0.6132 |
Best regards,
Mike Kaganski |
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Rank: Advanced Member Groups: Registered
Joined: 18/09/2014(UTC) Posts: 71 Was thanked: 7 time(s) in 7 post(s)
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sorry I missed the square three which makes everything much easier.
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Rank: Advanced Member Groups: Registered
Joined: 17/01/2013(UTC) Posts: 296 Location: Khabarovsk, Russia Was thanked: 151 time(s) in 107 post(s)
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Originally Posted by: critzker
solve(3t^3-2t+5=0,t)
but when I type t= to solve it, it doesnt give me an answer, just t= the black box
I'm afraid I didn't understand your problem the first time. I suppose you do the following: type "solve(3t^3-2t+5=0,t)" go to new line type "t=" and wait for the answer. That's not correct. solve is not a procedure that modifies its argument t; it is a function that returns a number, ant that number may (or may not) be assigned to a variable. You need to have the following: "t:=solve(3*t^3-2*t+5=0,t)" then your "t=" will give you the answer (in this form, it will be 2.743). |
Best regards,
Mike Kaganski |
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Rank: Advanced Member Groups: Registered
Joined: 18/09/2014(UTC) Posts: 71 Was thanked: 7 time(s) in 7 post(s)
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You should definitely use Maxima since the Smath solver misses the complex solutions. brotjob attached the following image(s):
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