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17 March, 03:18

9a-18b+21c apply distributive property to factor out gcf of all three terms

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  1. 17 March, 06:14
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    The GCF of the three terms (9a, - 18b and 21c) is 3

    Rewrite each of the terms so 3 is a factor

    9a = 3*3a

    -18b = - 3*6b

    21c = 3*7c

    So we can say ...

    9a - 18b + 21c = 3*3a - 3*6b + 3*7c

    9a - 18b + 21c = 3 (3a - 6b + 7c)

    Answer: 3 (3a - 6b + 7c)

    If you distribute outer 3 to each of the inner terms and multiply, you'll get the original expression again.
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