So, someone was showing me a math problem where he said he could get 1 = 2. Here's what he did:
Then, he factored:
Divided by (x - 1):
to cancel out (x - 1)
From where he plugged in x = 1:
Please explain to me why this fails, because it seems like it does in so many places, but I want to know why exactly! For instance, dividing by would be the same as dividing by zero, which would fail, but he thinks he's pretty much found where math has a weakness. I need expert verification!