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9 September, 17:48

What number goes in the box so that / [x^2 + 18x + / boxed{/phantom{00}}/]is the square of a binomial? If you find more than one, give your answer as a list.

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  1. 9 September, 17:56
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    81

    Step-by-step explanation:

    x² + 18x

    x² + 2 (x) (9) + 9²

    x² + 2 (x) (9) + 81

    (x + 9) ²
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