FUN001 · Functions & graphs · Classes 11–12
Functions
A function gives exactly one output for each input.
Functions📐 Formula
f(x) = ax + b; domain = inputs, range = outputs
✏️ Worked example
f(x) = 2x + 1: f(1) = 3, f(2) = 5, f(3) = 7.
🌍 Where it is used
Every formula and computer program is built from functions.
❓ Quick check
f(x) = 3x − 1. f(2) =