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[kwo-drat-iks] /kwɒˈdræt ɪks/

noun, (used with a singular verb)
1.
the branch of algebra that deals with equations.
[kwo-drat-ik] /kwɒˈdræt ɪk/
1.
.
2.
Algebra. involving the and no higher power of the unknown quantity; of the second degree.
noun
3.
/kwɒˈdrætɪk/
noun
1.
Also called quadratic equation. an equation containing one or more terms in which the variable is raised to the power of two, but no terms in which it is raised to a higher power
2.
of or relating to the second power

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.
(kwŏ-drāt’ĭk)
Relating to a mathematical expression containing a term of the second degree, such as x2 + 2. ◇ A quadratic equation is an equation having the general form ax2 + bx + c = 0, where a, b, and c are constants. ◇ The quadratic formula is x = -b ± √(b2 – 4ac)/2a. It is used in algebra to calculate the roots of quadratic equations.

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[kwod-ruh-cher, -choo r] /ˈkwɒd rə tʃər, -ˌtʃʊər/ noun 1. the act of squaring. 2. Mathematics. 3. Astronomy. 4. Electronics. the relation between two signals having the same frequency that differ in phase by 90°. /ˈkwɒdrətʃə/ noun 1. (maths) the process of determining a square having an area equal to that of a given figure or […]

(QAM) A method for encoding digital data in an analog signal in which each combination of phase and amplitude represents one of sixteen four bit patterns. This is required for fax transmission at 9600 bits per second. (1995-02-02)