The equation that expresses a mathematical rule or relationship is called a formula.
A formula in mathematics is an assertion of a fact, rule, or principle using mathematical symbols. Equations, equalities, identities, inequalities, and asymptotic expressions are a few examples of formulae.
Few examples of formulae are:
(a + b)^2 = a^2 + b^2 + 2ab
(a - b)^2 = a^2 + b^2 - 2ab
(a + b)^3 = a^3 + b^3 + 3ab(a + b)
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