# Chapter R - Review of Basic Concepts - R.5 Rational Expressions - R.5 Exercises - Page 53: 10

$\color{blue}{\dfrac{7y-8x^2}{x^2y}}$

#### Work Step by Step

Make the rational expressions similar by using their LCD of $x^2y$ to obtain: $\dfrac{7}{x^2}-\dfrac{8}{y} \\=\dfrac{7\color{magenta}{(y)}}{x^2\color{magenta}{(y)}}-\dfrac{8\color{magenta}{(x^2)}}{y\color{magenta}{(x^2)}} \\=\dfrac{7y}{x^2y}-\dfrac{8x^2}{x^2y} \\=\color{blue}{\dfrac{7y-8x^2}{x^2y}}$

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