Factorising with negative terms
Presentation
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Mathematics
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6th - 8th Grade
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Practice Problem
•
Medium
Murray Langfield
Used 23+ times
FREE Resource
8 Slides • 3 Questions
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2
Example (1): list all factors of 6 (pos and neg)
One possible list:
1, 6 or 2, 3
or
-1, -6 or -2, -3 (each of these pairs will multiply to give positive 6)
3
Example (2): list all factors of -12
Each pair has + and - because multiplying unlike pairs gives a minus.
-1, 12 or 1, -12 or -2, 6 or 2, -6 or -3, 4 or 3, -4
All of these pairs when multiplied, give -12
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The first step is to find the HCF of -3x and +6
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Multiple Choice
What is the negative HCF of -3x and +6?
-2
-1
-6
6
Fill in the Blanks
When we take a factor of -3 out of -3x, what is the remaining factor?
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Fill in the Blanks
When we take out a factor of -3 out of +6, what is the remaining factor?
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Factorising by taking out a negative HCF changes the sign
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Factorising: taking out a negative HCF changes the sign
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