# Chapter P, Prerequisites - Section P.7 - Rational Expressions - P.7 Exercises - Page 51: 50

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

#### Work Step by Step

We form a common denominator: $\displaystyle \frac{1}{x}+\frac{1}{x^{2}}+\frac{1}{x^{3}}=\frac{x^{2}}{x^{3}}+\frac{x}{x^{3}}+\frac{1}{x^{3}}=\frac{x^{2}+x+1}{x^{3}}$

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