3x^2=400

解

3 x^{2} = 400

x = \frac{20}{3}, x = - \frac{20}{3}

十進法表記

x = 11.54700 \dots, x = - 11.54700 \dots

解答ステップ

3 x^{2} = 400

以下で両辺を割る

3

x^{2} = \frac{400}{3}

x^{2} = f (a)

の場合, 解は

x = f (a), - f (a)

x = \frac{400}{3}, x = - \frac{400}{3}

\frac{400}{3} = \frac{20}{3}

- \frac{400}{3} = - \frac{20}{3}

x = \frac{20}{3}, x = - \frac{20}{3}