Sangeetha Pulapaka
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STEP 1: What are polynomials

https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:quadratics-multiplying-factoring/x2f8bb11595b61c86:multiply-monomial-polynomial/v/polynomials-intro

STEP 2: What are fractions

https://www.ducksters.com/kidsmath/fractions_introduction.php

STEP 2: What is an expression

http://home.avvanta.com/~math/def2.cgi?t=expression

STEP 3: What is a rational expression

 A rational expression is nothing more than a fraction in which the numerator and/or the denominator are polynomials. Here are some examples of rational expressions.

http://tutorial.math.lamar.edu/Classes/Alg/RationalExpressions.aspx

STEP 4: Answer

3x^{2} + 1 is  a rational expression, since this can be written as

\frac{3x^{2}+ 1}{1}