| 单词 | quadratic equation |
| 释义 | > as lemmasquadratic equation quadratic equation n. an equation of the second degree; spec. an equation of the form ax2 + bx + c = 0, where a, b, and c are constants and x is unknown. ΘΚΠ the world > relative properties > number > algebra > [noun] > expression > equation > named according to highest power quadratic equation1647 biquadratic1661 quadratic1674 linear1684 cubic equation1728 linear equation1816 biordinal1876 1647 J. Pell Let. 4 Nov. in J. Pell Corr. with C. Cavendish (2005) 518 Not so high as a quadratic equation. 1668 J. Wallis Let. 30 Mar. in H. Oldenburg Corr. (1967) IV. 290 He tells us, that in these two forms of Quadratick Equations, aa−ca+dd = 0, and aa+ca+dd = 0; the Roots are both Affirmative. 1706 W. Jones Synopsis Palmariorum Matheseos 128 All Quadratic Equations are reducible to one of these Forms. 1806 C. Hutton Course Math. (ed. 5) I. 247 A simple quadratic equation, is that which involves the square of the unknown quantity only. 1972 M. Kline Math. Thought ix. 186 The Hindus recognized that quadratic equations have two roots. < as lemmas |
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