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Why isn't Expand[] grouping terms by order?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg87825] Why isn't Expand[] grouping terms by order?
  • From: <p at dirac.org>
  • Date: Fri, 18 Apr 2008 02:38:56 -0400 (EDT)

Consider this:

   In[19]:= Expand[ (1+a*x)*(1+b*x), x]

                                 2
   Out[19]= 1 + a x + b x + a b x


How can I coax Mathematica to give me this, instead:

                                 2
   Want[19]= 1 + (a + b) x + a b x

Why isn't Mathematica reporting the answer in terms of powers of x?

Thanks!


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