In this lesson I teach you how to simplify a rational expression. This is a big topic and requires many skills to master to include a strong understanding of fractions, powers and exponents and polynomials. A rational number is a fraction where the numerator and denominator are integers. A rational expression is a fraction where the numerator and denominator are polynomials. When we simplify a fraction (rational number) we reduce it- example simplify the fraction 3/9. Of course 3/9 = 1/3 so my answer is 1/3 the fully simplified fraction equivalent to 3/9. The concept is no different when we are taking about simplifying rational expressions- we simply look to write the expression in it’s simplest form. I can’t over state how important it is for you to master this skill- your study of future algebra topics will be much, much easier if you understand it.