This is a useful method in the case in which φ(x) and ƒ(x) are quadratics, but scarcely ever in any other case.
I even showed her that problem in quadratics and told her I couldnt do it.
An advantage gained was that every quadratic equation, and not some quadratics only, could be spoken of as having two roots.
In connection with the sphere some easy work in quadratics may be introduced even if the class has had only a year in algebra.
The rapidity with which he would fill the blackboard, in solving difficult problems in quadratics, was almost bewildering.
1650s, "square," with -ic + obsolete quadrate "a square; a group of four things" (late 14c.), from Latin quadratum, noun use of neuter adjective quadratus "square, squared," past participle of quadrare "to square, set in order, complete" (see quadrant). Quadratic equations (1660s) so called because they involve the square of x.