Question

Which of the following is NOT a monomial? -2x, 0, 3xy, x-1

Answer 1

Answer:

x-1

Step-by-step explanation:

Answer 2

Answer:  Choice D)  x-1

Explanation:

A monomial is one term. The "mono" part means "one". Think of something like "monorail" to help remember that term.

The expressions -2x, 0 and 3xy are all monomials as they are one term when considered separately on their own. Therefore, we can rule out choices A,B,C.

In contrast, x-1 is not a monomial. Instead, it's a binomial consisting of the two terms x and -1. This is why choice D is the final answer.