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From Georgian Papers Programme Transcription Wiki
(29) Then xy = 180. And y = 180/x. But x;y::5:4. And 5y = 4x. Or y = 4x/5. Th. 180/x = 4x/5 Mult. formula Div. by formula Extr. formula Ergo y = 100/x =12
XIII. Of Quadratic Equation. 91. The equation xx = 225 of the last problem is as has been observ'd §32; a quadratic equation but it is only what algebrists call a simple underline quadratic equation, /underline to distinguish it from others, where the unknown quantity is found both of two & of one demension, as in the equation xx + ax = bb: And equations of this
