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24 November, 20:08

Question 15

Factorise 21-9x

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  1. 24 November, 21:33
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    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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