# Contents

Lesson 3 – Solving Quadratics 5

Free Maths Tutorial 5

Example 1 5

Example 2 6

Example 3 7

Example 4 7

Example 5 8

Example 6 8

Example 7 9

Example 7 Graph 9

Example 8 10

Example 9 10

Example 10 11

Example 11 12

Example 12 12

Example 13 13

Example 14 13

Example 15 14

Example 16 14

Example 17 15

Example 18 16

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# Lesson 3 – Solving Quadratics

## Free Maths Tutorial

These revision notes have been brought to you by an experienced Maths teacher - Mr Tom Nolan. These notes can be read in conjunction with the Free maths tutorial linked below. You will find this tutorial under iRevise.com, junior cert, maths, videos. These notes are suitable for Junior Certificate Students and covers solving quadratics. There is a work sheet and solutions that are an add on to the notes and can also be purchased from iRevise.com.

1 .Put the Quadratic = 0

2. Factorise it.

3. If no factors use the – b formula.

## Example 1

Solve

6= 1.6

2.3

x+2=0 Or x+3=0 1.6

x= 2 x= 3 2.3

Graph on next page.

Graph Cuts the x-axis at -2-3

̶ 3 ̶ 2

## Example 2

Use the –b Formula to solve it.

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