quadratic formula


Definition of quadratic formula 

: 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)

Examples of quadratic formula in a Sentence

Recent Examples on the Web

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, "The Supreme Court is an anti-democratic nightmare. Here’s how to fix it.," 29 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'quadratic formula.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of quadratic formula

1804, in the meaning defined above

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Last Updated

23 Aug 2018

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The first known use of quadratic formula was in 1804

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