The whetstone of witte, whiche is the seconde parte of arithmetike: containyng thextraction of rootes: the cossike practise, with the rule of Equation: and the woorkes of surde nombers (1557)
Recorde, Robert, 1510?-1558 · London : J. Kyngstone · leaf 93
of jfritJmetike. Squires
Algebra · Arithmetic
Internet Archive · Wellcome Library · Public domain (published before 1931). Free to use for anything.
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