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Puzzle: Who can spot what is wrong here? Theorem: 4 = 5 Proof: -20 = -20 16 - 36 = 25 - 45 4^2 - (9x4) = 5^2 - (9x5) 4^2 - (9x4) + 81/4 = 5^2 - (9x5) + 81/4 (4 - 9/2)^2 = (5 - 9/2)^2 4 - 9/2 = 5 - 9/2 4 = 5

Mathematics
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how did you get -20=-20 from 4=5
It's a puzzle.
The Theorem states 4 = 5 It is then followed by the proof

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Other answers:

oh that
the third to last step
sqrt of neg?
and what exactly is wrong with that step?
The step is squaring a negative 1/2 and the other is squaring 1/2
which is fine, since (-1/2)^2 = (1/2)^2
Yes but then the square root of that after is where the problem is
correct :)
you're choosing the positive side
not the same negative part you're squaring
yes - well done frees
it is essentially the same as saying: (-1)^2 = (1)^2 therefore -1 = 1
well spotted!
\[\pm[4-\frac92]=\pm[5-\frac92]\]

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