(997) 
may be reduc d thereunto^ by taking it away. More- 
over, when fuch iEquations, wherein you are incum- 
bred with FraHions or Snrds^ either in the Coeffi- 
cents or Roots, arepropofed, he goes on to find the 
Roots, fought in his own method? and when not ex- 
plicable but by zquamproxmcy according to the ge- 
neral method of ^/>^^^5 in the ufe of which method, 
he, determining the number af Figures in the Root ^ 
takes away the trouble of ail the fub-gradual 
Punftations- 
4. When he comes ta Bi-quadratick^ Mquations^ 
he intimates, that all fuch ^Equations may be redu- 
ced into two Q^adratic\ JE<^2it\ons^ but not without 
the aid of a Cubich^ -Equation : And firfl:^ when the 
fecond Term or Cubich^ Species is not wanting , he 
fliews how to find the faid Adjutant Cuhieh^ iEqua- 
tion, by placing the two higheft Terms of the JEqiii- 
tion on ane fide, and the reft of the Termes on the 
other, and then finds fuch Quantities,which,added to 
either fide^ render the fame capable of a fquare 
Root ; and this preparatron being made, he thereby 
pbtains the Cuhic\ ^Equation and the Root thereof, 
which ferves for the purpofe premifed ; to wit , to 
divide the Bt- quadratic}^ ^Equation proposed into 
two Quadratich^ Equations, and fo folved. 
Further, in regard that all ^Equations are more ea^ 
illy folv'd^ when fome of their Terms are wanting ^ 
than when all are prefent, he proceeds to (hew, how 
to take away the fecond Term, and, fuppoffng it gone^ 
gives ea&r Rules for finding the aforefaid Cubieh^ 
