8a^2-4=-5

解

8 a^{2} - 4 = - 5

a = \frac{1}{2 2} i, a = - \frac{1}{2 2} i

解答ステップ

8 a^{2} - 4 = - 5

4

を右側に移動します

8 a^{2} = - 1

以下で両辺を割る

8

a^{2} = - \frac{1}{8}

x^{2} = f (a)

の場合, 解は

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

a = - \frac{1}{8}, a = - - \frac{1}{8}

- \frac{1}{8} = \frac{1}{2 2} i

- - \frac{1}{8} = - \frac{1}{2 2} i

a = \frac{1}{2 2} i, a = - \frac{1}{2 2} i