100x^2+81=0

解

100 x^{2} + 81 = 0

x = \frac{9}{10} i, x = - \frac{9}{10} i

解答ステップ

100 x^{2} + 81 = 0

81

を右側に移動します

100 x^{2} = - 81

以下で両辺を割る

100

x^{2} = - \frac{81}{100}

x^{2} = f (a)

の場合, 解は

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

x = - \frac{81}{100}, x = - - \frac{81}{100}

- \frac{81}{100} = \frac{9}{10} i

- - \frac{81}{100} = - \frac{9}{10} i

x = \frac{9}{10} i, x = - \frac{9}{10} i