Identities (Edexcel GCSE Maths): Flashcards

A mathematical statement that is always true for all variable values

$\equiv$ (not $=$)

Identity is true for all values; equation only for specific values

Manipulate each side separately; don't use balance method

The more complex side (usually the left-hand side)

$2n$

$2n + 1$ or $2n - 1$

$3n$

$n$, $n + 1$, $n + 2$, ...

$2n$, $2n + 2$, $2n + 4$, ...

$2n + 1$, $2n + 3$, $2n + 5$, ...

Yes, always

Always show every line of your working step by step