8x^2+18=0

解

8 x^{2} + 18 = 0

x = \frac{3}{2} i, x = - \frac{3}{2} i

解答ステップ

8 x^{2} + 18 = 0

18

を右側に移動します

8 x^{2} = - 18

以下で両辺を割る

8

x^{2} = - \frac{9}{4}

x^{2} = f (a)

の場合, 解は

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

x = - \frac{9}{4}, x = - - \frac{9}{4}

- \frac{9}{4} = \frac{3}{2} i

- - \frac{9}{4} = - \frac{3}{2} i

x = \frac{3}{2} i, x = - \frac{3}{2} i