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30 September, 15:04

5a (2x-a) - (8a-x) (2x-a)

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  1. 30 September, 18:01
    Remember foil and distributive property

    note the invible - 1

    5a (2x-1) - 1 (8a-x) (2x-a)

    look at first bit

    5a (2x-a) = 10ax-5a^2

    2nd part

    -1 (8a-x) (2x-a)

    -1 (16ax-2x^2-8a^2+ax)

    -1 (17ax-2x^2-8a^2)


    now combine the 2 parts


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