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2 August, 16:09

S squared - 16s - 57

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  1. 2 August, 16:19
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    S² - 16s - 57 = s² - 16s + 64 - 121 = s² - 2*1*8 + 8² - (11) ² =

    we use the formula a ² - 2ab + b² = (a-b) ²

    (s - 8) ² - (11) ²

    we use the formula a ² - b² = (a+b) * (a-b)

    (s - 8) ² - (11) ²

    a² - b²

    [ (S - 8) - 11] * [ (S-8) + 11] = [S-19] * [S+3]
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