Not always. It could be a constant.
For example x is one variable, and y = x-2 is another variable. Then
x - y = x - (x-2) = 2.
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A monomial is an expression that is either:1) a numeral,2) a variable,or 3) the product of a numeral and one or more variables.A variable can be thought of as the product of the numeral 1 and the variable, thus making it a monomial.
Zero is a whole number and definition of monomial is " a number, or a variable, or a combination of a constant and a variable"
135ab is a monomial, where 135 is its coefficient.A monomial is a number or a variable or a product of numbers and variables.
The number of times that the variable occurs as a factor in the monomial. In other words, the exponent of the variable, e.g., x² - x + 6 is 2nd degree.
A monomial is an expression made up of a co-efficient, a variable , and an exponent that has only one term. Monomial = 4x ^2 4= co-efficient x=variable 2= exponent.