Re: Simplifying with positive constants
- To: mathgroup at smc.vnet.net
- Subject: [mg26104] Re: [mg26062] Simplifying with positive constants
- From: BobHanlon at aol.com
- Date: Tue, 28 Nov 2000 01:55:48 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
In a message dated 11/22/00 2:37:04 AM, djago at my-deja.com writes: >I'm trying to calculate some results and when I evaluate them I get: >1/2(r*a-a*d-Sqrt[4*r*a^2*d+(-r*a+a*d)^2] > >I know that this is a complicated way of saying: >r*a > >but Mathematica (3.0) doesn't seems to get the idea... > >I've tried with FullSimplify and so on... but Mathematica won't let a >go out of the Sqrt function. Maybe If I could tell Mathematica that a, >r and d are real and positive values... > test = 1/2(r*a - a*d - Sqrt[4*r*a^2*d + (-r*a + a*d)^2]); test2 // Simplify // PowerExpand // Simplify -a d Bob Hanlon