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Re: Simplify stuck in simple expression
 To: mathgroup at smc.vnet.net
 Subject: [mg50164] Re: Simplify stuck in simple expression
 From: carlos at colorado.edu (Carlos Felippa)
 Date: Wed, 18 Aug 2004 01:20:18 0400 (EDT)
 References: <cfsi9a$a78$1@smc.vnet.net>
 Sender: ownerwrimathgroup at wolfram.com
Bob Hanlon <hanlonr at cox.net> wrote in message news:<cfsi9a$a78$1 at smc.vnet.net>...
> expr = (2Sqrt[72*(1+a*b)^2+4])/(2*a);
>
> You can work around the problem by using a temporary change in variables
> (x = a*b + 1)
>
> Simplify[expr /. b> (x1)/a] /. x>a*b+1
>
> or
>
> Simplify[expr /. a> (x1)/b] /. x>a*b+1 // Cancel
>
>
> Bob Hanlon
>
Unfortunately it isnt practical. That expression is inside a deep
loop that solves thousands of quadratic equations, and the expressions
under Sqrt keep changing. I just cooked up a simplified form for
posting.
Is there an equivalent of FactorTerms that can force a numerical
factor out of a symbolic square root?
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