Tuesday, 17 May 2016

algebra precalculus - What is going wrong in this "proof" of 0=1?





20=201636=2545424×9=525×9424×9+81/4=525×9+81/4424×9+(9/2)2=525×9+(9/2)2



Considering the formula a2+2ab+b2=(ab)2, one has
(49/2)2=(59/2)2(49/2)2=(59/2)249/2=59/24=544=540=1


Answer



Here let me simplify your process:



(2)2=4(2)2=222=22+2=2+20=4



QED. Do you see the mistake?


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