GCSE Maths (Edexcel)

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Changing the Subject

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Algebra Notation, Vocabulary and Manipulation

Changing the Subject

6:07 Formulae
Spec A5
Previous Using Formulae Next Proofs
  • Formulas can be rearranged to change the subject
  • Inverse operations are used to rearrange formulas
  • Inverse operations must be performed on both sides of the formula to maintain equality
  • The inverse operation to addition is subtraction
  • The inverse operation to multiplication is division
  • The inverse operation to squaring is taking the square root
  • The inverse operation to cubing is taking the cube root
  • Swapping what's on either side of the equal sign can provide a shortcut when rearranging formulas
  • When performing multiple inverse operations, perform addition or subtraction before multiplication or division

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