Re: Factor.....

• To: mathgroup at smc.vnet.net
• Subject: [mg70986] Re: Factor.....
• From: dh <dh at metrohm.ch>
• Date: Fri, 3 Nov 2006 01:39:41 -0500 (EST)
• References: <eicnmq\$g3i\$1@smc.vnet.net>

```
Hi,

you have to tell Mathematica what form you want.

Assume e.g. that we want the form (A^2 + a1 A + a0)(A^2 + b1 A + b0).

Then we expand, equate the coefficients of A and solve for a0,a1,b0,b1:

r1=CoefficientList[(A^2+A a1+a0)(A^2+b1 A+ b0)//Expand,A]

r2=CoefficientList[A^4+3+y^2,A]

this gives several possible expansions.

Daniel

gtsavdar at auth.gr wrote:

> How can i factor A^4 + 3 + y^2 (A,y reals) for example with

> Mathematica.....?

>

>

> (

> In order to have:

> (A^2 + SQRT(y^2+3) + A·SQRT(2*SQRT(y^2+3))) · (A^2 + SQRT(y^2+3) -

> A·SQRT(2*SQRT(y^2+3)))

> )

>

> (

> OR:

> (y^2 - i·SQRT(A^4+3)) · (y^2 + i·SQRT(A^4+3))

> )

>

>

> Thanks....

>

```

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