2yx

2yx denotes the product of the constant 2 and the variables y and x. In algebra, it is a monomial of total degree two in x and y. Because multiplication is commutative, 2yx equals 2xy.

As a term in a multivariate polynomial, 2yx appears wherever the term xy is present with coefficient 2. For example, in p(x,y) = 3x^2y + 2xy + 1, the second term can be read as 2xy or 2yx.

If x and y are real numbers, 2xy is the same as 2yx. The value is zero whenever x = 0 or y = 0.

Differentiation and integration follow standard rules: ∂/∂x(2xy) = 2y and ∂/∂y(2xy) = 2x; ∫2xy dx = x^2y + C and ∫2xy dy = xy^2 + C.

In writing, 2yx without explicit multiplication can be ambiguous in code or plain text, so it is common to write 2*y*x or 2xy to avoid confusion.

See also Monomial, Polynomial, Multivariate algebra.