Functions (AQA A-Level Mathematics): Quizzes

$f(x) = x^2 + 2$

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

Set of $x$ values we can feed the function

Set of $y$ values $y = f(x)$ can take

$f(x) \leq 2$

Undefined for $x \leq -3$

$g(x) \geq e^2$

Draw a horizontal line; if it intersects twice

Many-to-one

Many-to-many