4=5??
Theorem: 4 = 5
Proof:
-20 = -20
16 - 36 = 25 - 45
4^2 - 9*4 = 5^2 - 9*5
4^2 - 9*4 + 81/4 = 5^2 - 9*5 + 81/4
(4 - 9/2)^2 = (5 - 9/2)^2
4 - 9/2 = 5 - 9/2
4 = 5
posted by Anonymous at 5:27 PM
Monday, October 03, 2005
Proof:
-20 = -20
16 - 36 = 25 - 45
4^2 - 9*4 = 5^2 - 9*5
4^2 - 9*4 + 81/4 = 5^2 - 9*5 + 81/4
(4 - 9/2)^2 = (5 - 9/2)^2
4 - 9/2 = 5 - 9/2
4 = 5
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3 Comments:
WHOA!!!tat's amazing..
its wrong la :P
You can't simply remove the ^2 like that. You must consider the plus minus.
Like just because
a^2 = b^2
It doesn't mean that
a = b
Maybe a = -b and b = -a
Like Mrs Koh always says.. squaring introduces extra answers :P
So must always check to see if the all the answers satisfy the equation.. In this case
-(4 - 9/2) = (5 - 9/2)
and
(4 - 9/2) = -(5 - 9/2)
are acceptable. But
-(4 - 9/2) = -(5 - 9/2)
and
(4 - 9/2) = (5 - 9/2)
are not.
where got 4 = 5 wan :P
salute salute!!!
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