Thread: A math puzzle
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Old November 20 2012, 08:31 AM   #4
Rhubarbodendron
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Re: A math puzzle

the error is in line#1:
9-24 = -15
25-40 = 15

While techically (meaning the way the equation is being treated with completing the square, radicating [correct word??] etc.) the procedure is correct, you start the "proof" under the false premise that -15 = +15
This triggers a cascade of errors with the rest of the calculation, much like a domino-effect:
In Line #2 you get 1 = 31
In Lines #3 and #4 the equation reads as -1 = +1


The important thing - both in mathematics and in life - is to never take anything for granted but always to check the supposed facts yourself, without blindly relying on others.
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Last edited by Rhubarbodendron; November 20 2012 at 08:44 AM.
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