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mathematical expression of the second degree in one or more unknowns (see polynomialpolynomial,
mathematical expression which is a finite sum, each term being a constant times a product of one or more variables raised to powers. With only one variable the general form of a polynomial is a0xn+a1x
). The general quadratic in one unknown has the form ax2+bx+c, where a, b, and c are constants and x is the variable. A quadratic equation ax2+bx+c=0 always has two rootsroot,
in mathematics, number or quantity r for which an equation f(r)=0 holds true, where f is some function. If f is a polynomial, r is called a root of f; for example, r=3 and r
, not necessarily distinct; these may be real or complex (see numbernumber,
entity describing the magnitude or position of a mathematical object or extensions of these concepts. The Natural Numbers

Cardinal numbers describe the size of a collection of objects; two such collections have the same (cardinal) number of objects if their gives the roots of any quadratic equation in terms of its coefficients a, b, and c. The expression b2−4ac is called the discriminant and vanishes when the two roots coincide. If a, b, and c are real and the discriminant is not less than zero, the roots are real.

(mathematics)
Any second-degree expression.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Maths
1. 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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Based on the nine generated models (Figures 3a, b, c), there was proper adjustment of power (0.9723<[R.sup.2]<0.9925) and quadratic (0.9613[less than or equal to][R.sup.2] [less than or equal to]0.9871) models, regardless of the considered linear dimension (L, W, or LW).
It can be seen that the linear elements give the upper bound solution, while the quadratic elements result in lower bound value .
Kok concludes that the function must be quadratic, since the first derivative of a quadratic function is linear and the second derivative is constant.
The rest of the paper is organized as follows: Section 2 presents the methodology of the Ehrenfest theorem in two dimensions; in Section 3, we apply this methodology to a linear and quadratic coupled quantum dot to harmonic potential and present the numerical study of the semiquantum equations' motion.
Researches on quadratic programming with interval coefficients have been discussed by Liu and Wang , Li and Tiang , and Syaripuddin et al.
The quadratic form of the Gibbs potentials corresponds to the assumption of a normal priori distribution.
Students have always been able to look up the quadratic equation rather than memorise it, but opening a new browser tab takes moments, not the minutes required to locate the right page in the right book.
The fit summary put forward that the quadratic model is statistically significant for analysis of MRR.
Because, in accordance with Equation 6, the characteristic curve of the external system obeys the same quadratic relationship, the new operating point of the external system also moves from A to B.

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