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17 December, 13:28

Factor completely 5 x^{2} - 80

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  1. 17 December, 16:39
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    Remember

    a^2-b^2 = (a-b) (a+b)

    5 (x^2-16)

    5 (x^2-4^2)

    5 (x-4) (x+4)
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