College Algebra / Unit 5 Alg 275 short lesson, about 20 seconds
Function Composition
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The idea
Function composition feeds one function's output into another as input: (f ∘ g)(x) = f(g(x)), reading inside out.
In practice
For f(x) = x² and g(x) = x + 1: f(g(2)) runs g first — g(2) = 3 — then f: f(3) = 9. Two machines, one assembly line.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
- Nothing. This is a starting point.
Unlocks
- Nothing yet depends on this.
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