Cube (algebra)

In arithmetic and algebra, the cube of a number n is its third power, that is, the result of multiplying three instances of n together. The cube of a number n is denoted n, using a superscript3, for example 2 = 8. The cube operation can also be defined for any other mathematical expression, for example (x + 1).

The cube is also the number multiplied by its square:

n = n × n = n × n × n.

The cube function is the functionx ↦ x (often denoted y = x) that maps a number to its cube. It is an odd function, as

(−n) = −(n).

The volume of a geometric cube is the cube of its side length, giving rise to the name. The inverse operation that consists of finding a number whose cube is n is called extracting the cube root of n. It determines the side of the cube of a given volume. It is also n raised to the one-third power.

The graph of the cube function is known as the cubic parabola. Because the cube function is an odd function, this curve has a center of symmetry at the origin, but no axis of symmetry.