Linked Questions

15
votes
9answers
51k views

$2+2 = 5$? error in proof

$$\begin{align} 2+2 &= 4 - \frac92 +\frac92\\ &= \sqrt{\left(4-\frac92\right)^2} +\frac92\\ &= \sqrt{16 -2\times4\times\frac92 +\left(\frac92\right)^2} + \frac92\\ &= \sqrt{16 -36 + \...
0
votes
2answers
463 views

False Proof of $7=8$ [duplicate]

I have found something really weird which compelled me to put up this post. I wish I could resolve this problem but was unsuccessful. Consider a positive integer say 7 , now is it possible to prove ...