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# Title: [Johannis Wallis S. T. D. Geometriae Professoris Saviliani, in Celeberrima Academia Oxoniensi, De Algebra Tractatus; Historicus & Practicus. Anno 1685 Anglice editus; Nunc Auctus Latine. Cum variis Appendicibus; Partim prius editis Anglice, Partim nunc primum editis] Johannis Wallis S. T. D. Geometriæ Professoris Saviliani, in Celeberrima Academia Oxoniensi, De Algebra Tractatus; Historicus & Practicus. Anno 1685 Anglice editus; Nunc Auctus Latine. Cum variis Appendicibus; Partim prius editis Anglice, Partim nunc primum editis (shelfmarks Leibn. Marg. 100:1/2, Stück 2; Leibn. Marg. 100:1/2)
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Pract
Piracti
10cet
s
Cap. XL. V
A F G H B R.
a.
G A P. XLV.
Fjusdem usus, ad resolvendas aequationes Cubicas.
N Aquationibus Cubicis (eisque altioribus) res operotior est quam in Oua-
dratieis. Onamvis enim, in his, pariter acque in illis tollatur secundus ter-
 minus; hoc tamen Tublato, reltat alius porro intermedius (li non ee plures)
adhue collendus, ut prodeat aequatio simplex.
HOC ve tiat, in Cubicis; tublato uc jam dietum est (siquis adsic) termino
secundo; sic prosrcdiue ille (etemplis XII e XIII.)
XII. AEquatio aaa = 3bba = + 2656.
POTito,
a - ee
Adcoque Feceeee = 3bbecec + 3bbbb ec = bbbbbb
Fit
Hoc est
3bbecee = 36bbbee
Leccece = =bbbb0b +2c0cceC.
+ecec = 26CC e eC = = bbbbbb.
Oux est A quatio Onadratica aftecta, Tolidam radicem habens eee.
FIxC ut reducatur ad quadraricam simplicem; hac (pro more Tuo) utitur
methodo: Nimirum; Ouadeatum semi coetticientis termini medii, addit utrique
parti aequationis: (quo pars prior tiai Quadracum in Speciebus.)
eccoce = 206cecC = CCCCCC = bbbbbb =CCCC6C.
Adeoque radix trujus.
eec = cc0 = =V: = bbbbbb =CCC2CC.
(Ubi ralor altirmatirus aue negatirus locum trabet, prout cec minor est aut
major quam eec. Adeoque, hoc calu, valor altirmatirus; quoniam, Cx PrO.
celtu hactenus praeterito, jam liquet, e majorem este quam c.)
Adeoque eec = +000 = V: = 3b8bbB = CCCCCC.
FF
e = 1C. + 0cc = V: + bbbbbB. + CCCCCC:
Tum, quoniam (ex constructione) a Xqua C 
dum valorem iptius; notat eec. bbB.
306200
leue -: Ad exquiren.
eeo. elle quancicales concinue
proportionales. Adeoque et carum radices cubicas c. b. 
Indeque protae,  = Y C. - 506 = V: bb6bbb + e66666.
26
(Nam