f'(x) 

The first derivative of a function. See calculus.

If f(x) is equal to x^2+2x+5
then f'(x) is equal to 2x+2.

f'(x) by ManMan36 May 23, 2016

f(x)

f(x) is a South Korea-based girl group formed by S.M. Entertainment in 2009. In August 2015, it was announced that Sulli had officially left the group to focus on acting. The remaining members: Victoria, Amber, Luna, and Krystal, continued as a group, releasing their fourth studio album, 4 Walls, in October.

Why did Fifth Harmony Camila's departure reminded me of Sulli leaving F(X)...?

f(x) by jennie kim December 28, 2016

f(x)

f(x) (Korean: 에프엑스; pronounced /ˌɛf ˈɛks/) is a South Korean girl band formed by SM Entertainment. The group made their debut on September 1, 2009.

The members are:
- Victoria (Leader, Lead Dancer)
- Amber (Main Rapper)
- Luna (Lead Vocal, Main Dancer)
- Sulli (Vocal, Rapper)
- Krystal (Maknae, Main Singer, Main Dancer)

A : Ugh, I don't get this whole f(x) thingy.. (Looking at the math book)
B : What? how come you don't get them?! F(x) is like one of the hottest girl groups from South Korea!
A : Eh?

f(x) by affxtionate June 20, 2011

f(x)=11 

when the output of a particular function is always equal to 11. Common notation variations include fx11, fx=ll, or fxll.

"Damn, I love functions, especially that f(x)=11 thing, its so easy" - some random guy.
"*moans* fxll-chan" - Owen

f(x)=11 by s3m3nd3m0n June 10, 2022

f(x_x)f 

A zombie face emoticon. The f's represent hands.

Person 1: Dude are you awake?

Person 2: f(x_x)f

Person 1: What the fuck?

Person 2: I'm a zombie

f(x_x)f by Malignant Mind October 23, 2008

f(x) = e^x 

The only function in the world that satisfies ∫f(x)dx = f(x) and d/dx f(x) = f(x). Very dumb.

Question: ∫f(x) = f(x)
Because ∫f(x) = e^x
Therefore, the solution is e^x

f(x) = e^x by BladeX123uWu December 18, 2022

X.f.X 187™️ 

X.F.X 187™️. Is a thug Life way of living. And is a part of murdered out Empire 187™️ close line it means two strike feleon

Aight G you ready to do this hit. Even tho we both have X.F.X 187™️ as it is anyways G... fuck it let's do it????

X.f.X 187™️ by k187c October 3, 2020