单词	quadratic formula
释义	quadratic formula noun : a formula that gives the solutions of the general quadratic equation ax2 + bx + c = 0 and that is usually written in the form x = (-b ± √(b2 − 4ac))/(2a) Example Sentences Recent Examples on the Web Most high school students know how to solve quadratic equations, such as −x−3=0, using the quadratic formula. Quanta Magazine, 30 June 2022 That’s when students turn to the quadratic formula. Jonathan Corum, New York Times, 5 Feb. 2020 What algebra students currently learn Before students are presented with the quadratic formula, they’re taught a simpler method to solve certain equations. Jonathan Corum, New York Times, 5 Feb. 2020 The upshot is that the quadratic formula ensures that, in our town, the collective well-being of the public is maximized through the voting system. Eric Posner And Glen Weyl, Vox, 29 June 2018 When a referendum is held, people exchange their voice credits for votes, according to a quadratic formula: one vote costs one credit; two votes cost four credits; three votes cost nine credits; and so on. Eric Posner And Glen Weyl, Vox, 29 June 2018 Word History First Known Use 1804, in the meaning defined above
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