7d^2+5=0

解

7 d^{2} + 5 = 0

d = \frac{5}{7} i, d = - \frac{5}{7} i

解答ステップ

7 d^{2} + 5 = 0

5

を右側に移動します

7 d^{2} = - 5

以下で両辺を割る

7

d^{2} = - \frac{5}{7}

x^{2} = f (a)

の場合, 解は

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

d = - \frac{5}{7}, d = - - \frac{5}{7}

- \frac{5}{7} = \frac{5}{7} i

- - \frac{5}{7} = - \frac{5}{7} i

d = \frac{5}{7} i, d = - \frac{5}{7} i