A1–A4 · Expressions & Brackets
What is the difference between an expression, an equation, a formula and an identity?
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Expression: terms with no equals sign (3x + 2). Equation: can be solved (3x + 2 = 11). Formula: links variables (A = πr²). Identity: true for every value (≡), e.g. 2(x + 1) ≡ 2x + 2.