25x^2=4

解

25 x^{2} = 4

x = \frac{2}{5}, x = - \frac{2}{5}

十進法表記

x = 0.4, x = - 0.4

解答ステップ

25 x^{2} = 4

以下で両辺を割る

25

x^{2} = \frac{4}{25}

x^{2} = f (a)

の場合, 解は

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

x = \frac{4}{25}, x = - \frac{4}{25}

\frac{4}{25} = \frac{2}{5}

- \frac{4}{25} = - \frac{2}{5}

x = \frac{2}{5}, x = - \frac{2}{5}