For some types of equations or simultaneous equations, there are formulas that give their solutions, and such formulas are called solution formulas. Some of these formulas relate to some types of differential equations. Cramer's rule for simultaneous linear equations is also an example of a solution formula. The other important case is the case of algebraic equations, which we will discuss below. In this case, it is also called the root formula. (a) The root of the quadratic equation aX 2 + bX + c = 0 ( a ≠ 0) is D = b 2 - 4 ac , which is called the discriminant. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
いくつかの型の方程式または連立方程式には,その解を与える公式があり,そのような公式を解の公式と呼ぶ。その中には,いくつかの型の微分方程式に関するものがある。また連立一次方程式についてのクラメールの公式も解の公式の一例である。その他の重要な場合は代数方程式の場合であるので,それについて述べる。この場合は根の公式とも呼ばれる。(a)二次方程式aX2+bX+c=0(a≠0)の根は,D=b2-4acを判別式discriminantという。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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