Thread: Four is equal to five

Four is equal to five

Theorem: 4 = 5

Proof:
-20 = -20
16 - 36 = 25 - 45
4^2 - 9*4 = 5^2 - 9*5
4^2 - 9*4 + 81/4 = 5^2 - 9*5 + 81/4
(4 - 9/2)^2 = (5 - 9/2)^2
4 - 9/2 = 5 - 9/2
4 = 5

Hence Proved............

^ means square.

You can't do a direct "=" when you do a square root.

sqrt(a) can be + or - sqrt(a).


So step 6 is wrong.

-F

I know
then there will be two results;

1. 4=5

2.
4 - 9/2 = -(5 - 9/2)
4 - 9/2 = 9/2 - 5
9 = 9
as we know it...........

So, 1

1. is the wrong result. you have to discard it.

Originally Posted by Punch Farce

1. is the wrong result. you have to discard it.

I know.........
But it is only a trick.
Nothing else.

If 4 = 5 then the first step itself is wrong as -20 cannot be equal to -20.

Originally Posted by alokmis

If 4 = 5 then the first step itself is wrong as -20 cannot be equal to -20.

-F

Originally Posted by Punch Farce

-F

Whats that suppose to mean?

Originally Posted by alokmis

Whats that suppose to mean?

you missed the joke.....

Originally Posted by rajan1311

you missed the joke.....

Even I couldn't understand that. Can you please explain it?