Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**saundo****Member**- Registered: 2009-10-20
- Posts: 8

i have proven not that 1=2 but that 2=3.41 i am only 16 but im pretty sure there are no faults in this. what i did and expalnations on how are written below

x=2 y=2

x=y

x^2=y+x

√(x^2 )=√(y)+(x)

x=1.41+x

2=1.41+2

2=3.14

line1 x=2 y=2

line 2 therefore x=y

line 3 add x to both sides( since x=2 and 2+2 Is the same as 2^2 it become x^2)

line 4 square root both sides of the equation

line 5 we are left with x=1.41+x because √2 is 1.41 to 2 decimal places

line 6 substitute the pro-numeral x with the its value (2) leaves us with 2=1.41+2

line 7 the answer is 2=3.41

find any faults now?

*Last edited by saundo (2009-10-21 00:44:46)*

Offline

**dannyv****Member**- Registered: 2007-09-20
- Posts: 34

the problem is between line4 and 5. You cannot distribute the square root, i mean,

To my knowledge there is no way to decompose a square root

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,631

I removed a rude comment

Nice try, saundo, but Algebra still wins

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

Offline

**saundo****Member**- Registered: 2009-10-20
- Posts: 8

dannyv wrote:

the problem is between line4 and 5. You cannot distribute the square root, i mean,

To my knowledge there is no way to decompose a square root

for some reason the brackets did not come up properly

Offline

**simplyjasper****Member**- Registered: 2009-11-15
- Posts: 24

3rd line itself is wrong...

If y = x,

x + y = 2x or 2y not x^2

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 107,680

Hi;

For x=2 and y=2 as he states in line 1:

You can say x + y = x^2.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**DaveRobinsonUK****Member**- Registered: 2010-04-24
- Posts: 123

Hi Saundo

Are you using a calculator? If so are you pressing the equals sign when you add x+y or entering x then add then y

then the sqrt.

I get 1.4142136, which is the approximation of the sqrt(2) and when I then press = I get 3.4142136

The reason for this is that calculators and programming languages evaluate certain operations before others

usually following the BIDMAS rules. Since SQRT() is a division operation it would be evaluated first on the

associated number, which is 2.

If you have a bracket function, you should get 2. The correct answer should be (+/-2)

Can feel it coming together.. Slowly but Surely

Offline

**thewordalive****Member**- Registered: 2010-09-27
- Posts: 4

MathsIsFun wrote:

I removed a rude comment

Algebra still wins

algebra wins, but geometry pwns >:]

Offline