5x^2=256

解

5 x^{2} = 256

x = \frac{16}{5}, x = - \frac{16}{5}

十進法表記

x = 7.15541 \dots, x = - 7.15541 \dots

解答ステップ

5 x^{2} = 256

以下で両辺を割る

5

x^{2} = \frac{256}{5}

x^{2} = f (a)

の場合, 解は

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

x = \frac{256}{5}, x = - \frac{256}{5}

\frac{256}{5} = \frac{16}{5}

- \frac{256}{5} = - \frac{16}{5}

x = \frac{16}{5}, x = - \frac{16}{5}