Answer: Option A
:
A
A polynomial isa mathematical expression of one or more algebraic terms each of which consists of a constant multiplied withone or more variables raised to a non-negative integral power . For example, $(a+bx+c{x}^2)$ where a, b and c are constants, and x is the variable.
Degree is the highest power of the variable.
$4x+2$is apolynomialof degree 1.
$\frac{1}{(x+1)}=(x+1{)}^{-1}$, the degree of thisexpression would notbe non-negative. Thus, it is not a polynomial.
$4x+2=0$ is an equation and hence not a polynomial.
$x+y$ is a polynomial in twovariables, x and y.