GCSE Maths (Edexcel)

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Identities

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Algebra Notation, Vocabulary and Manipulation

Identities

5:35 Identities and Functions
Spec A6
Previous Simplifying Advanced Algebraic Fractions Next Function Machines
  • An identity is an equality that is always true for any values of variables
  • An identity can be shown using the identically equal to sign (three horizontal lines)
  • Identities are useful for rearranging expressions, formulae, and equations
  • To determine if a statement is an identity or an equation, expand and compare the left and right sides
  • If the statement is always true regardless of the values of the variables, it is an identity
  • If the statement is only true for specific values of the variables, it is an equation
  • To find the values of variables in an identity, compare the left and right sides and simplify
  • Use the fact that an identity is always true to determine the values of the variables

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