f(x)
Output from input
F(x) is mathematical notation meaning "a function of x"—the output value produced when x is the input.
The parentheses don't indicate multiplication; they show that f operates on whatever's inside: If f(x) = x², then f(3) = 9.
Different letters name different functions: g(x), h(x).
The notation extends to multiple variables: f(x, y).
In casual use, f(x) sometimes stands in for any mathematical expression or formula.
Purpose or duty
- variableProne to fluctuation
- equationMathematical equality assertion
- derivativeFunction's rate of change
- integralAntiderivative or crucial component
domain · range · graph · notation · calculus · polynomial · input · output
- AmberEnglish feminine name
- LunaRoman moon deity
- VictoriaFemale monarch's name
- SM EntertainmentKorean pop music conglomerate
girl group · debut · choreography · comeback · MV · fandom · idol · concert
function
Purpose or duty
- variableProne to fluctuation
- equationMathematical equality assertion
- derivativeFunction's rate of change
integral · domain · range · graph · notation · calculus · polynomial · input · output · mapping
Krystal
SM Entertainment · girl group · debut · choreography · comeback · MV · fandom · idol · concert · visual
parentheses
Curved enclosing punctuation marks
composition · argument · parameter · operator · symbol · syntax · expression · bracket · exponent · coefficient
- Pop GroupsBackstreet Boys, NSYNC, Spice Girls, Destiny's Child, TLC
- K-popBTS, ARMY, girl group, boy band, idol group
- SM EntertainmentMark, Johnny, Lucas, Kai, Irene
f(x)constant
Fixed, unvarying quantity
invariant · literal · scalar · coefficient · parameter