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21 November, 02:28

Factor completely 5x2 - 5x - 100.

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  1. 21 November, 05:49
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    First, factor out 5:

    5 (x² - x - 20)

    We need two numbers that add to - 1 and multiply to - 20. - 5 and 4 satisfy this.

    5 (x-5) (x+4)
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