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6 December, 15:12
S squared - 16s - 57
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Troy Mills
6 December, 16:57
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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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