[Formative Quiz] Algebra Factorisation: Cross Method

Resource: You may watch the clips in the following playlist(s) to recap and view more examples before attempting the assigned collection:

• Factorisation (4) Cross Method
• (Playlist) S1 Maths Factorisation (III) Using Cross Method

Click HERE to access padlet

Algebra: Factorisation using Special Products

Resource: Study Noes (p15)

During lesson, we went through Q8, Q7 & Q9.
I've included the step-by-step working below, with some notes for Q7 & Q9.
I hope that will help you to recap the thinking behind the steps.

Read the TIPS - let them become part of your good habit.

Cheng Rui's answer

A little bit unclear though... hope that it is not too hard to read


Feedback: 
🧐 Note that there are "+" among the terms in the numerator; similar situation for denominator. 
We can only "cancel" away the common factors if all the terms in the numerator & denominator mutliply to each other. So, the "cancelling" here is not valid.

Bhargavi's Answer for Challenging Qs 5

Feedback: 
🧐Think again... from the given expression to the first line of your working. Can we split the mega-fraction into individual fractions? 

Challenging Qn 5 (by kiern)

Feedback: Well done! 👍👍👍
Would be better if you could insert one more line between the given expression and the first line of the working to show how the numbers are 'broken down' in the way you described at the side note.

Challenging Algebra #5

Clarity is important!

Present your working clearly and systematically.

Post your answer in the Maths blog

Label the heading clearly.

CLUE: Factorisation by common factors

Algebra: Factorisation using Special Product A^2 - B^2 = (A + B)(A - B)

We discussed Examples 1, 2 & 3 in yesterday's lesson.

Here's the LEVEL 2 examples (e.g. 4 & 4), which we discuss in today's lesson
 - in particular, need to pay attention to the ( ) or [ ]

Challenging Qn 4 (Bhargavi's answer)

Challenging Qn 4 (Bhargavi's answer)

@Kiern: Why did you post the answer on behalf of Bhargavi?

Feedback: 
(a) 👍👍👍
(b) Think again... Can we 'separate' the given fraction into 2? 
Clue: You will need to simplify both numerator and denominator by factorisation first 

Challenging Qn 4 (by Kiern Ray)

Feedback: 
(a) 👍👍👍
(b) Think again... Can we 'separate' the given fraction into 2? 
Clue: You will need to simplify both numerator and denominator by factorisation first