# Outline of algebra

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Algebra is one of the main branches of mathematics, covering the study of structure, relation and quantity. Algebra studies the effects of adding and multiplying numbers, variables, and polynomials, along with their factorization and determining their roots. In addition to working directly with numbers, algebra also covers symbols, variables, and set elements. Addition and multiplication are general operations, but their precise definitions lead to structures such as groups, rings, and fields.

## Algebraic equations

An algebraic equation is an equation involving only algebraic expressions in the unknowns. These are further classified by degree.

## General algebra concepts

• Algebra
• Fundamental theorem of algebra – states that every non-constant single-variable polynomial with complex coefficients has at least one complex root. This includes polynomials with real coefficients, since every real number is a complex number with an imaginary part equal to zero.
• Linear equation – an algebraic equation with a degree of one
• Quadratic equation – an algebraic equation with a degree of two
• Cubic equation – an algebraic equation with a degree of three
• Quartic equation – an algebraic equation with a degree of four
• Quintic equation – an algebraic equation with a degree of five
• Polynomial