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Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

First of all you need to know what a polynomial needs to have to be called a polynomial. A polynomial need to have the power of it's variables as whole numbers, i.e non-negative. We can write as . So this is correct that this is an expression with one variable [only x]. But since it has a (-1) power over x, it is not a polynomial.