*From*: "Peter D. Junger" <junger@xxxxxxxxxxxxxxxxxxxx>*To*: lit-ideas@xxxxxxxxxxxxx*Date*: Fri, 23 Jun 2006 18:17:47 -0400

Erin Holder writes: : 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...?) A better way to solve and remember how to solve the problem may be to realize that if you factor x^2+2x+y^2 you get (x+y)(x+y) which equals (x+y)^2 which you are told equals 9. Now the square of (x+y)^2 is (x+y)^4 which equals 9^2 which equals 81. It's hard to do this stuff in ASCII. Good luck, Peter -- Peter D. Junger--Case Western Reserve University Law School--Cleveland, OH EMAIL: junger@xxxxxxxxxxxxxxxxxxxx URL: http://samsara.law.cwru.edu ------------------------------------------------------------------ To change your Lit-Ideas settings (subscribe/unsub, vacation on/off, digest on/off), visit www.andreas.com/faq-lit-ideas.html

**References**:**[lit-ideas] Don't Laugh (Math)***From:*Erin Holder