The geometrical key

or, The gate of equations unlock'd : a new discovery of the construction of all equations, howsoever affected, not exceeding the fourth degree, viz., of linears, quadratics, cubics, biquadratics; and the finding of all their roots, as well false, as true, without the use of mesolabe, trisection of angles, without reduction, depression, or any other previous preparation of equations, by a circle, and any (and that but one only) parabole : and this, by one only general rule, than which a more simple, more perfect, more general, more easie to be understood, or more fit for practice, cannot be devised or wished for : fortified with demonstrations, illustrated with figures, to each equation, and exemplified with numeral equations, (according to all the varieties of cases,) adapted to each figure : for the use of young mathematicians, a work hitherto desired

by Thomas Baker

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