22-03-2018
Mathematics

contestada

Question 15
Factorise 21-9x

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MsEHolt MsEHolt

01-04-2018

The factored form would be 3(7-3x).

The GCF of these two is 3; that is the largest number either of them can be divided by, and they do not have a variable in common. This gives us:

3( )

21/3 = 7, so we have:
3(7 )

9x/3 = 3x, which gives us

3(7-3x)

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