0.999....=1

[pleaserecycle]

Barozi said:

JRPGfan said:

 

How do you go from:

10x = 9+x

to

10x-x=9   <---- (isnt this part wrong?)

 

Shouldnt it be:

(10x)/x = 9

your doing division by X, on both sides of the equation right? to move the x on the side of the 9, across.

no he's subtracting x.

If he was dividing by x it would be as follows:

10x = 9+x

10*(x/x) = 9 + (x/x)

Obviously (x/x) is 1, so

10*1 = 9 + 1

10 = 10

considering you want a result that is "x = ..." it wouldn't make sense to divide by x in that case.

But what if x = 0?  :D