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x2-x2=x2-x2

x(x-x)=(x+x)(x-x)

x=x+x

1x=2x

1=2?

 Apr 27, 2015

Best Answer 

 #2
avatar+33661 
+5

This is similar to my comment here: http://web2.0calc.com/questions/what-happens-when-you-divide-by-zero_2 

 

The division by x - x is not allowed because x - x is zero.  Division by zero is not allowed precisely because it leads to inconsistencies like 2 = 1 as you have demonstrated.

 

(For those who are puzzled by the move from the first to the second line: x2 - x2 can be written as x(x - x) because x is a common factor; and it can also be written as (x - x)(x + x) because it's the difference of two squares).

 Apr 27, 2015
 #1
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Why do you have at the first line the same numbers on each side and on the second you don´t?

I think that the enswer is 0=0 because on both sides you have the same so you can substract x2-2x from both sides and you get 0=0 

so the enswer is all nubers 

 Apr 27, 2015
 #2
avatar+33661 
+5
Best Answer

This is similar to my comment here: http://web2.0calc.com/questions/what-happens-when-you-divide-by-zero_2 

 

The division by x - x is not allowed because x - x is zero.  Division by zero is not allowed precisely because it leads to inconsistencies like 2 = 1 as you have demonstrated.

 

(For those who are puzzled by the move from the first to the second line: x2 - x2 can be written as x(x - x) because x is a common factor; and it can also be written as (x - x)(x + x) because it's the difference of two squares).

Alan Apr 27, 2015
 #3
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0

0=0  X    cheeky

 Sep 19, 2016

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