College Algebra / Unit 5 Alg 232 short lesson, about 20 seconds
Functions
Captions available
The idea
A function is a relation in which each input leads to exactly one output; one input, one answer, every time.
In practice
Each account number pays out exactly one balance — a function. One number paying two balances would break the bank and the definition.
Where people slip
Two inputs may share an output; one input may never split.
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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