Harriot, Thomas - Mss. 6784

Harriot, Thomas, Mss. 6784

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802401v

[Commentary:

Here Harriot solves the equation

25 = 6 a - a a

(in modern notation,

25 = 6 x - x^{2}

) for the roots

3 + \sqrt{- 1}

and

3 - \sqrt{- 1}

. He then checks by multiplication that these values do indeed satisfy the equation. ]