## Algebra## Algebra Explained |

## What are some other terms used in dealing with algebraic equations? |

There are many terms in algebra, including those dealing with equations. The following lists some of the more common ones:

*Equality* and *inequality*—An equality is a mathematical statement that shows the equivalence of two quantities. For example, if *a* is equal to *b,* it is written as the equality *a* = b. An inequality is just the opposite: *a* does not equal *b*, or *a ≠ b.*

*Formula*—A formula is a rule, fact, or principle expressed in terms of mathematical symbols, including equations, equalities, identities, or inequalities. (Note: the plural of formula in Latin is “formulae,” but it is more readily accepted today as “formulas.”)

*Identity*—An identity is a mathematical relationship equating one quantity to another that initially may appear to differ; it also means an equation that is always true, such as the Pythagorean theorem (for more about identities, see below).