Functions
Choose a lesson to learn an idea, or open chapter practice to choose questions.
The lessons take about an hour in all.
- 01What can go in, and what can come out?
Read domains and ranges as sets, including turning points and values that are only approached. - 02When does an inverse exist?
Learn to spot repeated outputs, choose a domain, and keep the correct inverse branch. - 03Can one function feed another?
Follow the order of a composite, check every intermediate output, and map the final range.