Introduction to quadratic equations and graphs

Essential Mathematics Year 9

Downloadable Lesson notes

Chapters

Welcome

Learning objectives

Recap of past learning

Why do we only want the points where it crossed the x-axis?

Lots of forms of quadratic equations

Solving ax^2-d=0

Taking the square root gives us two values

Example 1

Example 2

Example 3

The return of DOPS

Final words

Description

This is the second video in the Year 9 Mathematics series looking at quadratic equations. I love quadratics and this video will give a sense of why. Solving simple quadratic equations is awesome. When you identify them as being of the form ax^2 -d=0, you know that you can factorise, use DOPS, the null factor law and then you have the crossing points on your x-axis, otherwise known as your solutions. OK. It's hard to explain in writing and so this video looks at a number of examples and uses DESMOS.com to show you what a solutions is and how to find it for simple quadratic equations.

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