06-24-2011, 05:05 PM
(This post was last modified: 06-24-2011, 05:06 PM by 18cwatford.)
That is COMPLETELY INCORRECT.
It doesn't work because 9.999... is not rational and therefore when multiplied is rounded.
You can tell the rounding error by plugging it back in.
10(1) =/= 9.999...
why? because 10 does not equal 9.999...
Didn't teachers tell kids to check their answers by plugging it back in?
Also this would appear as invalid in a calculator because a variable cannot have 2 numbers unless they are the same.
You cannot have X as .999 and as 1, they are different numbers. [unless it is a quadratic which it is not]
Which leads to another point, don't trust wikipedia.
It doesn't work because 9.999... is not rational and therefore when multiplied is rounded.
You can tell the rounding error by plugging it back in.
10(1) =/= 9.999...
why? because 10 does not equal 9.999...
Didn't teachers tell kids to check their answers by plugging it back in?
Also this would appear as invalid in a calculator because a variable cannot have 2 numbers unless they are the same.
You cannot have X as .999 and as 1, they are different numbers. [unless it is a quadratic which it is not]
Which leads to another point, don't trust wikipedia.
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