math 12

Here is question on an math assignment I was given, I have no clue what it is even asking.
It's a Challenge Yourself question, I've typed it exactly how it is on my paper:

A student is having difficult figuring out what is wrong with his proof:

Let C=D
C^2=CD
C^2 - D^2 = CD - D^2
(C - D)(C + D) = D(C - D)
C + D = D
However C=D
D + D = D
2D = D
2 = 1 ???

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asked by M
  1. If C=D, C-D=0 and you cannot divide by zero.

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    posted by Steve
  2. Oh I get it now! Thanks

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    posted by M

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