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2 + 2 equals 5?


Let's check:

We start with the following equality, which is true:

16-36 = 25-45

We add (81/4) on both sides, which does not change equality:

16-36+(81/4) = 25-45+(81/4)

This can be written as follows: (perfect square trinomial)

(4-(9/2))2 = (5-(9/2))2

Apart from the square root on both sides we have:

4-(9/2) = 5-(9/2)

Adding (9/2) on both sides of equality we have:

4 = 5

As 4 = 2 + 2 we come to the following conclusion:

2+2=5

Obviously this demonstration has an error because we all know that 2 + 2 is not equal to 5 (or does anyone have any questions?). Click below to find out what the error is:

In this demonstration comes a stage where we have:

(4-(9/2))2 = (5-(9/2))2

According to the demonstration, the next step is:

Take the square root on both sides, obtaining:

4-(9/2) = 5-(9/2)

There is the mistake !!!

It is wrong because SQUARE ROOT of a number SQUARED is equal to MODULE of this number. So the correct would be:

| 4-(9/2) | = | 5-(9/2) |

| -0,5 | = | 0,5 |

0,5 = 0,5

Next: 2 Is Greater Than 3?