Functions (AQA A-Level Mathematics): Flashcards

$f(x) = x^2$

Set of $x$ values we can 'feed' a function

Set of $y$ values $f(x)$ can take for given domain

Real numbers

Natural numbers: $\{1, 2, 3, ...\}$

Integers

Multiple $x$ values map to same $y$ value

One $x$ value maps to multiple $y$ values

Check if many-to-one (line intersects more than once)

No inverse