Hi Erin,
my dad asked me if I knew how to do this, and coincidentally, we just
went over this this year in math class.
How you solve the problem is you first multiply out (x+y)^4, which
gives you, if you don't simplify it completely,
(x^2+2xy+y^2)(x^2+2xy+y^2). This is the same as the first equation,
only multiplied by itself, so to get the answer, you need to multiply
the 9 by itself, which gives you 81. I hope this helps.
Julia Ritche
On Jun 23, 2006, at 12:35 PM, Erin Holder wrote:
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...?)
Erin TO
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