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[kwo-drat-ik] /kwɒˈdræt ɪk/
1.
2.
Algebra. involving the square and no higher power of the unknown quantity; of the second degree.
noun
3.
1650-1660
First recorded in 1650-60; quadrate + -ic
Related forms
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for quadratic
Contemporary Examples
• “When I was in third grade, I was in quadratic equations when my class was, like, reading clocks,” Andraka says.

• As a teen, Randy had painted a submarine, an elevator door and the quadratic equation on the walls of his childhood bedroom.

October 8, 2008
Historical Examples
• It is right, but too lengthy to be worth as much as a quadratic.

Lewis Carroll
• It had never been determined if that order was quadratic, cubic or higher.

Roger Phillips Graham
• What does matter is thisI must ask you to tell me exactly why you wished me to work out that quadratic problem for you.

Pauline Lester
• She now began to read Euclids Elements, and proceeded in algebra as far as quadratic equations.

I. Platts
• Since the fraction is infinite it cannot be commensurable and therefore its value is a quadratic surd number.

• Method: Solve for x as in terms of y, or vice versa, in the linear and substitute in the quadratic.

Romeyn Henry Rivenburg
• All I ask is to live simply and sensibly, but instead of that my existence is transformed into a quadratic equation.

E. Arnold Bennett
• quadratic Equation, an equation involving the square of the unknown quantity.

Edited by Rev. James Wood

/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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for quadratic

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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 quadratic   (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.
The American Heritage® Science Dictionary
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