I know there is error in this but! If i can substitute 1 for x here.
Originally Posted by http://www.amatecon.com/1equals2errors.html
x = 1 set x equal to 1
x2 = x multiply both sides by x
x2 - 1 = x - 1 subtract 1 from both sides
(x - 1)(x + 1) = x - 1 separate left side into factors
x + 1 = 1 divide both sides by (x - 1) 1 + 1 = 1 substitute 1 for x
2 = 1
Originally Posted by Error
Division by (x-1) is not allowed since x=1 and therefor x-1=0 and division by zero is an undefined operation.