# Simplifying rational expressions and restrictions

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### Introduction

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### Examples

#### Lessons

- For each rational expression:

i) determine the non-permissible values of the variable, then

ii) simplify the rational expression - For each rational expression:

i) determine the non-permissible values of the variable, then

ii) simplify the rational expression - For each rational expression:

i) determine the non-permissible values of the variable, then

ii) simplify the rational expression - The area of a rectangular window can be expressed as $4{x^2} + 13x + 3$, while its length can be expressed as $4x + 1$.
- For each rational expression:

i) determine the non-permissible values for $y$ in terms of $x$ , then

ii) simplify, where possible.