15x

15x is a symbolic expression used in mathematics to denote the product of the scalar 15 and a variable x. More generally, it represents multiplying any quantity by 15, where x can be a number, a vector, or any quantity that supports scalar multiplication. If x is a real or complex number, 15x equals 15 times x. If x is a vector, 15x denotes scalar multiplication, yielding a vector in the same direction as x with its magnitude scaled by 15. If x carries units, the units are scaled by 15 accordingly.

In algebra, 15x is a linear term; 15 is the coefficient of x. In expressions such as y = 15x + b, 15 plays the role of the slope with respect to x in linear function contexts.

Other uses of "15x" appear in everyday language and branding. In marketing, "15x" is commonly used to denote a fifteenfold increase (for example, "15x faster"), though such claims are qualitative and context-dependent. In product names or slogans, "15x" is sometimes used as a cue to suggest enhanced performance or growth, but such usages are varied and not standardized.

See also: multiplication, scalar multiplication, coefficients, linear functions.