A treatise containing an entire new method of solving adfected quadratic, and cubic equations, [electronic resource] : with their application to the solution of biquadratic ones; In an easier, and more concise Way, than any yet publish'd; together with the Demonstrations of the Methods. And a set of new tables for finding the roots of cubics. Invented by the late ingenious Mr. A. Thacker, deceased; but calculated entirely, and in a great Measure exemplified, by W. Brown, Teacher of the Mathematicks, at the Free-School, in Cleobury, Shropshire.