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)

Raleigh slang for a function, as in a party. More commonly used as abbreviation while typing.

Pronounced “f of x”.

Yo how was the f(x) last night?

Dammmn twelve pulln up to the f(x).

f(x) by Destroyer of Toilets August 8, 2026

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