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Originally posted by Zunaid
Note the chopped off head on the left 
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And that would be you?
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This unique piece of math work was done by a friend of mine (a group work actually, took us about 4-5 class periods, but was more exciting than listening to the teacher)
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It took you 4-5 class periods to make up the joke, or 4-5 class periods to solve it?
The basic problem is that the sqrt of a number can be +ve or -ve i.e sqrt(4) = +/-2. The fourth last line simplifies to (-0.5)^2 = (0.5)^2 and so the third last line should read +/-(sqrt(4-9/2)) = +/-(sqrt(5-9/2))
Second last line should be -(4-9/2) = (5-9/2)
And so last line should be -4+9/2 = 5-9/2