In this lesson you will learn how we can factorise quadratics using an array.

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

## Question 6

Q1.Which expression is equivalent to a² - b² ?

1/6

Q2.Match the expression equivalent to (x+4)(x-4).

2/6

Q3.Match the expression equivalent to (x+9)(x-3).

3/6

Q4.Which calculation would work out 64² - 4² ?

4/6

Q5.Match the expression equivalent to (x+25)-(x-25).

5/6

Q6.Match the expression equivalent to (73+x)(73-x).

6/6

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

## Question 6

Q1.Which expression is equivalent to a² - b² ?

1/6

Q2.Match the expression equivalent to (x+4)(x-4).

2/6

Q3.Match the expression equivalent to (x+9)(x-3).

3/6

Q4.Which calculation would work out 64² - 4² ?

4/6

Q5.Match the expression equivalent to (x+25)-(x-25).

5/6

Q6.Match the expression equivalent to (73+x)(73-x).

6/6

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

Quiz:

Show off what you know!

## Question 6

Q1.Fill in the gap: ________ is the opposite of expanding.

1/6

Q2.Factorise x² + 11x + 24.

2/6

Q3.Factorise x² + 14x + 24.

3/6

Q4.Factorise x² + 8x + 16.

4/6

Q5.Factorise x² - 25.

5/6

Q6.A quadratic expression x² + bx + 20 can be factorised. Find all the possible values for b when b is positive.

6/6

Quiz:

Show off what you know!

## Question 6

Q1.Fill in the gap: ________ is the opposite of expanding.

1/6

Q2.Factorise x² + 11x + 24.

2/6

Q3.Factorise x² + 14x + 24.

3/6

Q4.Factorise x² + 8x + 16.

4/6

Q5.Factorise x² - 25.

5/6

Q6.A quadratic expression x² + bx + 20 can be factorised. Find all the possible values for b when b is positive.

6/6

# Lesson summary: Factorising quadratics (Part 1)

### Time to move!

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For 5 mins...

Move around:
Climb stairs

On the spot:
Chair yoga

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