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19 February, 22:41

What is (7r - 1) (8r^2 + 8r + 1)

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  1. 20 February, 00:24
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    (7r - 1) (8r² + 8r + 1)

    7r * (8r² + 8r + 1) - 1 * (8r² + 8r + 1)

    56r³ + 56r² + 7r - 8r² - 8r - 1

    56r³ + 56r² - 8r² + 7r - 8r - 1

    56r³ + 48r² - 8r² - r - 1
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