言語

二次方程式ソルバー

実数および複素数解を持つ二次方程式を解きます

For equation ax² + bx + c = 0

結果

値を入力して、計算をクリックすると結果が表示されます。

理論と公式

A quadratic equation is a polynomial equation of degree 2, with the general form ax² + bx + c = 0, where a ≠ 0.

The quadratic formula provides the solution(s) to any quadratic equation. The discriminant (b² - 4ac) determines the nature of the roots:

  • Δ > 0: Two distinct real roots
  • Δ = 0: One real root (double root)
  • Δ < 0: Two complex conjugate roots
\(x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\)

解説付き例題

例 1

\(x^2 - 5x + 6 = 0 \rightarrow x_1 = 3, x_2 = 2\)

例 2

\(x^2 - 4x + 4 = 0 \rightarrow x = 2\) (double root)

例 3

\(x^2 + x + 1 = 0 \rightarrow\) Complex solutions
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