Portal:High school mathematics/Mathematical errors

WARNING: THIS PAGE IS A WORK IN PROGRESS. IT WILL PROBABLY NEVER BE FINISHED.

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Classic Maths Mistakes

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Here I am collecting mistakes in maths which do not work. Ok, let's start the(so far, small)list!

MISTAKE 1: (b+1)²=b²+1

MISTAKE 2: (a+b)^2=a^2+b^2

How to add new mistakes

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Just put in your maths mistake and put 'MISTAKE X' above it. X is the number of the mistake.