2.1.2

Algebraic Concepts

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Expressions, Equations, Formulae and Identities

Expressions, equations and formulae all look similar but have small differences between them.

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Expression

  • An expression is a collection of letters and numbers with no '=' sign.
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Equation

  • An equation is two expressions which are equal to each other.
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Formula

  • A formula is a special type of equation which shows the relationship between different variables.
    • E.g. Area of a circle (A) = π × radius of the circle² (r²)
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Identity

  • An identity is an equation which is always true, whatever the value of the variables (e.g. x, y etc).
    • Note the special equals sign used for an identity.

Jump to other topics

1Number

1.1Place Value

1.2Factors & Multiples

1.3Operations

1.4Fractions, Decimals & Percentages

1.5Growth & Decay

1.6Measurements & Units

1.7Accuracy

2Algebra

3Ratio, Proportion & Rates of Change

4Geometry & Measures

5Probability

6Statistics

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