Thread: .9999...=1
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Old December 3rd, 2012, 03:36 AM   #68 (permalink)
wyndslash
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Quote:
Originally Posted by jhawkkw View Post
.99999... does in fact equal 1 and can be easily mathematically proved.

Let x=.9999999......
Therefore 10x=9.99999.......
10x-x =9x. == 9.99999.....-.999999....=9
So 9x=9
9x9 = 99
Therefore x=1 which was equal to .999999... originally.
don't let students know that (some profs say that 69.999 doesn't equal 70, lol)
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