## Quick Reference

A real number that is the root of a polynomial equation with integer coefficients. All rational numbers are algebraic, since *a*/*b* is the root of the equation *bx*−*a*=0. Some irrational numbers are algebraic; for example, *a*/*b* is the root of the equation *x*^{2}−2=0. An irrational number that is not algebraic (such as *π*) is called a transcendental number.

*Subjects:*
Mathematics.