       Re: cubic equation solver

• To: mathgroup at smc.vnet.net
• Subject: [mg130252] Re: cubic equation solver
• From: Costa Bravo <q13a27tt at aol.com>
• Date: Fri, 29 Mar 2013 05:56:11 -0400 (EDT)
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• References: <kj0tko\$iiv\$1@smc.vnet.net>

```Elim Qiu wrote:
>
> But Mathematica says:
>
> Solve[x^3 + (Sqrt + 2 Sqrt + 2 Sqrt - 9) x + 2 Sqrt -
>     Sqrt - 2 == 0, x]
>
> {{x -> (1/
>        2 (18 + 9 Sqrt - 18 Sqrt +
>          I Sqrt[3 (4662 - 1252 Sqrt - 1296 Sqrt -
>             ........

Solve[x^3 + (Sqrt + 2 Sqrt + 2 Sqrt - 9) x + 2 Sqrt -
Sqrt - 2 == 0, x]//FullSimplify

Out(2)= {{x -> -Sqrt + Sqrt}, {x -> 2 - Sqrt}, {x -> -2 + Sqrt}}

--
Costa

```

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