Increasing & Decreasing Functions (Edexcel A-Level Mathematics): Quizzes

$f(x_1) \leq f(x_2)$

$f(x)$ is increasing on that interval

$f(x)$ is decreasing on that interval

Where $f'(x)$ is zero or undefined

Constant on that interval

The sign of the derivative

Calculate the first derivative $f'(x)$

$x = 0$ and $x = 2$

$f'(x) = -\frac{1}{x^2}$ is always negative

Finding maximum or minimum values