### Introduction

This Section describes how functions involving a constant numerator and a squared variable denominator can be used in adding sound energies of different sources.

#### Prerequisites

• be competent at algebraic manipulation
• be familiar with polynomial functions
• be able to use Pythagoras’ theorem
• be able to use the formula for solving quadratics

#### Learning Outcomes

• model inverse square problems
• use a graphical method to solve a quadratic equation