Originally Posted by
ferdo Ok, the question we got was to identify and explain one critical error in the factoring example.
this is the example:
X=X
X Exponent 2 = X Exponent 2
X Exponent 2 - X Exponent 2 = X Exponent 2 - X Exponent 2
X(X - X) = (X + X) (X - X)
X(X - X) = (X + X) (X - X)
-------- --------------
(X - X) (X - X)
X = (X + X)
X = 2X
If we let X = 1, then upon substitution we have
(1) = 2(1)
1 = 2
I think the problem lies in line 3 right side, (X + X) (X - X), should it be like the left side X(X - X)?
Thanks for your help.