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English definition of “quadratic equation”

quadratic equation

noun [C]  /kwɑˈdræt̬·ɪk ɪˈkweɪ·ʒən/
algebra an equation (= mathematical statement) that includes an unknown value multiplied by itself only once, and does not include an unknown value multiplied by itself more than once; an equation that can be expressed as ax²+bx+c=0, when a does not equal zero
(Definition of quadratic equation noun from the Cambridge Academic Content Dictionary © Cambridge University Press)

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