Math
Function notation.
Definition
A way of writing functions using the format f(x) to name the function and show the input variable. f(x) is read as 'f of x' and represents the output value when x is the input.
Examples
Real-world.
- 1 If f(x) = 2x + 3, then f(4) = 2(4) + 3 = 11
- 2 g(x) = x² means g(−3) = 9
- 3 A phone plan cost function C(m) = 30 + 0.10m where m is minutes used
Key Fact
f(x) does NOT mean f times x; it means the output of function f for input x.