Re: how do i solve this polynom?
- To: mathgroup at smc.vnet.net
- Subject: [mg37646] Re: [mg37609] how do i solve this polynom?
- From: Vladimir Bondarenko <vvb at mail.strace.net>
- Date: Thu, 7 Nov 2002 06:42:11 -0500 (EST)
- References: <200211061154.GAA22853@smc.vnet.net>
- Reply-to: Vladimir Bondarenko <vvb at mail.strace.net>
- Sender: owner-wri-mathgroup at wolfram.com
"Boris" <kyboris at bezeqint.net> wrote on Wednesday, November 06, 2002, 7:54:28 AM
B> how do i solve this polynom?
B> 2x^3+6x^2+5x+2=0?
B> anyone can help?
If you want to find the roots, call Solve and remember to use '==' and not '=' .
For example,
In[1] := Solve[2x^3 + 6x^2 + 5x + 2 == 0, x]//InputForm
Out[1] = {{x -> -2}, {x -> -1/2 - I/2}, {x -> -1/2 + I/2}}
(* To get to a specific root, you may wish to use something like *)
In[2] := Solve[2x^3 + 6x^2 + 5x + 2 == 0, x][[1, 1, 2]]
Out[2] = -2
(* To see the numeric values, calculate *)
In[3] := N[Solve[2x^3 + 6x^2 + 5x + 2 == 0, x]]
Out[3] = {{x -> -2.}, {x -> -0.5 - 0.5 I}, {x -> -0.5 + 0.5 I}}
(* or apply NSolve *)
In[4] := NSolve[2x^3 + 6x^2 + 5x + 2 == 0, x]
Out[4] = {{x -> -2.}, {x -> -0.5 - 0.5 I}, {x -> -0.5 + 0.5 I}}
There is a nice detailed discussion of the topic at
Help -> Help Browser -> Built-in Functions -> Algebratc Computation ->
Equation Solving -> Solve
Or better, instead of clicking through the Help Browser wasting your
time, you can simply set the cursor at Solve or NSolve and hit tha F1
key to reach the help on Solve/NSolve and enjoy reading ;-)
Best wishes,
Vladimir Bondarenko
Mathematical and Production Director
Symbolic Testing Group
Email: vvb at mail.strace.net
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- References:
- how do i solve this polynom?
- From: "Boris" <kyboris@bezeqint.net>
- how do i solve this polynom?