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

You are not logged in.

- Topics: Active | Unanswered

**Kumar Gaurav****Member**- Registered: 2014-05-25
- Posts: 8

Hey I was just playing with nos. I found a formula to sq. A no. I.e.

(<n-1>squared)+(2n+1)

'n' here implies the no. You want to sq.

*Last edited by Kumar Gaurav (2014-05-25 22:11:33)*

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 93,618

Hi;

I can not follow that. Please explain a little better.

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

**Kumar Gaurav****Member**- Registered: 2014-05-25
- Posts: 8

This works if you know sq of no. Which lies before it just add 2xno.+1 to sq of no. Lying before the no.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 93,618

You mean like this:

(2 * 6 + 1) + 6^2 = 49 which is 7^2?

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

**Kumar Gaurav****Member**- Registered: 2014-05-25
- Posts: 8

bobbym wrote:

You mean like this:

(2 * 6 + 1) + 6^2 = 49 which is 7^2?

yes sir!

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 93,618

Hi;

This is because of the algebraic identitiy

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

**Kumar Gaurav****Member**- Registered: 2014-05-25
- Posts: 8

Thanks for informing I will post more.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 93,618

Welcome to the forum.

**In mathematics, you don't understand things. You just get used to them.**

Offline

**Kumar Gaurav****Member**- Registered: 2014-05-25
- Posts: 8

bobbym wrote:

Welcome to the forum.

thanks

Offline