# Guess the Formula!

Discussion in 'Community Discussion' started by imaketouchtheme, Apr 7, 2009.

1. ### imaketouchtheme macrumors 65816

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#1
Just thought I'd create a thread where you try to guess a formula (one that's known widely) from the poster above you. If you correctly guess, you can then post one for the next person to guess. Also, no Googling!

Formula:

x(t)=x_0∙e^kt=x_0∙e^(t/τ )=x_0∙2^(t/T)=x_0∙(1+r/100) ^(t/p)

2. ### Shaun.P macrumors 68000

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#2
What an intriguing idea for a thread.

I'm in my second year of a maths degree. This formula does not look familiar.

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4. ### imaketouchtheme thread starter macrumors 65816

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#4
Got it! Now it's your turn to post a formula if you would like.

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7. ### eldy macrumors 6502

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#7
that's the formula for being a 40 year old virgin.

8. ### KompleX macrumors regular

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#8
the number of primes less than or equal to x.

here is one that nobody will be able to figure out! muhahaha!!

(1/2)(base)(height)

9. ### jmann macrumors 604

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#9
Area of a triangle?

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10. ### minicoop503 macrumors regular

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#10
area of a triangle!!

easy..

x = (b^2 +- sqrt(b^2 - 4ac))/2a

11. ### paolo- macrumors 6502a

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Aug 24, 2008
#11
edit posted at the same time as mini ^^^ well that's the equation to solve a quadratic equation. and jmann to, that's the equation of rate of a slope.
Area of a triangle, c'mon...

keeping with the easy one,

PV=NRT

I sadly know most of my equations only in french, don't want to verify them in english.

12. ### minicoop503 macrumors regular

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#12

ideal gas law

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#13
...

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14. ### Shaun.P macrumors 68000

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#14

15. ### Shaun.P macrumors 68000

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#15

Edit: Wait isn't it -b not b^2?

16. ### Shaun.P macrumors 68000

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17. ### mickbab macrumors 65816

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#17
I do believe you are right.

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#18

19. ### miles01110 macrumors Core

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#19
Here's a good one.

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20. ### fireshot91 macrumors 601

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#20
Slope formula.

EDIT: He said Gradient of a line..I'm guessing its the same thing?

21. ### imaketouchtheme thread starter macrumors 65816

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#21
Please enlighten us, I have no clue whatsoever.

22. ### theyoda3 macrumors member

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#22
Klein-Gordon Equation

Give this a try, it's pretty neat.

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23. ### imaketouchtheme thread starter macrumors 65816

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#23
Some kind of sinc function.

Yea, I have no clue and I don't think anyone else does either. Let us know?

24. ### imaketouchtheme thread starter macrumors 65816

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#24
Anyone else want to post some equations. We will all be smarter.

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