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why is this happening?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg99198] why is this happening?
  • From: sean_incali at yahoo.com
  • Date: Wed, 29 Apr 2009 06:40:23 -0400 (EDT)

Consider the following.

Solve[k1 ld + k1 k2 + ld^2 == 0, ld]

vs

Solve[k2/k1 + ld^2 + ld == 0, ld]


I expected to get the output I got from the first code.

>From the second code, I was expecting something along the lines of

ld ->-1 + (SquareRoot[1 - 4 (k2/k21)])/2
ld -> -1 - (SquareRoot[1 - 4 (k2/k21)])/2

since that is the answer.

Why is Mathematica turning the second scaled equation into the
unscaled one in the first before solving it?

Thanks for any insight.

Sean



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