[lit-ideas] Don't Laugh (Math)

  • From: Erin Holder <erin.holder@xxxxxxxxxxx>
  • To: lit-ideas@xxxxxxxxxxxxx
  • Date: Fri, 23 Jun 2006 15:35:24 -0400

OK, who can explain to me how to solve this:

If     x^2+2xy+y^2 = 9      then   (x+y)^4 = ? 

I know the answer is "81", I just don't know how to get it.  It's starting to 
frustrate me.  I haven't done this stuff in almost ten years, and I can't for 
the life of me remember how to go about it (although I seem to be getting the 
hang of some of the other ones...?)


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