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Mckinney
Mathematics
26 May, 19:18
Prove (correctly) that if 1 = - 1, then 2=1
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Monica Arias
26 May, 19:30
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This may not be entirely satisfied proof but you should get the idea.
Proof: Start with 1 = - 1.
Then we know that if a = b then a + c = b + c and also a / c = b / c.
So we can add 1 to both sides.
We have 1 + 1 = - 1 + 1 ⇒ 2 = 0.
Now divide both sides by 2 and we would have 1 = 0.
Now add both sides by 1. This yields 2 = 1.
Therefore if 1 = - 1 then 2 = 1.
QED
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