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asnaseer
Group Title
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
 2 years ago
 2 years ago
asnaseer Group Title
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
 2 years ago
 2 years ago

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lgbasallote Group TitleBest ResponseYou've already chosen the best response.0
how did you get 20=20 from 4=5
 2 years ago

Freyes Group TitleBest ResponseYou've already chosen the best response.3
It's a puzzle.
 2 years ago

asnaseer Group TitleBest ResponseYou've already chosen the best response.0
The Theorem states 4 = 5 It is then followed by the proof
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.0
oh that
 2 years ago

Freyes Group TitleBest ResponseYou've already chosen the best response.3
the third to last step
 2 years ago

JakeV8 Group TitleBest ResponseYou've already chosen the best response.0
sqrt of neg?
 2 years ago

asnaseer Group TitleBest ResponseYou've already chosen the best response.0
and what exactly is wrong with that step?
 2 years ago

Freyes Group TitleBest ResponseYou've already chosen the best response.3
The step is squaring a negative 1/2 and the other is squaring 1/2
 2 years ago

asnaseer Group TitleBest ResponseYou've already chosen the best response.0
which is fine, since (1/2)^2 = (1/2)^2
 2 years ago

Freyes Group TitleBest ResponseYou've already chosen the best response.3
Yes but then the square root of that after is where the problem is
 2 years ago

asnaseer Group TitleBest ResponseYou've already chosen the best response.0
correct :)
 2 years ago

Freyes Group TitleBest ResponseYou've already chosen the best response.3
you're choosing the positive side
 2 years ago

Freyes Group TitleBest ResponseYou've already chosen the best response.3
not the same negative part you're squaring
 2 years ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.0
yes  well done frees
 2 years ago

asnaseer Group TitleBest ResponseYou've already chosen the best response.0
it is essentially the same as saying: (1)^2 = (1)^2 therefore 1 = 1
 2 years ago

asnaseer Group TitleBest ResponseYou've already chosen the best response.0
well spotted!
 2 years ago

oldrin.bataku Group TitleBest ResponseYou've already chosen the best response.0
\[\pm[4\frac92]=\pm[5\frac92]\]
 2 years ago
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