Longman Dictionary of Contemporary English homepage

Topic: MATHS

Date: 1600-1700
Origin: quadratic from quadrate 'square' (14-21 centuries), from Latin quadratus, past participle of quadrare 'to make square'

quadratic equation

noun
     
quad‧rat‧ic e‧qua‧tion [countable]
technicalHM an equation such ax²+by+c = z, which includes numbers or quantities multiplied by themselves
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