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Factor and/or Rules replacements
 To: mathgroup at smc.vnet.net
 Subject: [mg104443] Factor and/or Rules replacements
 From: yves <yves.dauphin at solvay.com>
 Date: Sun, 1 Nov 2009 03:56:16 0500 (EST)
Hello everybody,
Here is the model problem:
I tried to obtain the factorisation of x^2+b x +c and expected to get something like (x1/2(b+Sqrt[b^24 c))((x1/2(bSqrt[b^24 c)).
So I tried
in:Factor[x^2+b x + c] and get
out: c + b x + x^2
So my first question what should I have done?
I tried another way
in:sol=Solve[x^2+b x + c == 0,{x}]; and get the couple of replacement rules.
Next I defined
in: f=(xx1)(xx2)
and finally I replaced x1 and x2 in succession by
in:f /. {(sol[[1]] /. x > x1), (sol[[2]] /. x > x2)}
which gave the expected factorisation but enclosed in {}.
My second question is :
Is there a simpler way or more compact to replace x1 and x2?
With anticipated thanks.
Yves
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