81x^2+49=0

解

81 x^{2} + 49 = 0

x = \frac{7}{9} i, x = - \frac{7}{9} i

解答ステップ

81 x^{2} + 49 = 0

49

を右側に移動します

81 x^{2} = - 49

以下で両辺を割る

81

x^{2} = - \frac{49}{81}

x^{2} = f (a)

の場合, 解は

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

x = - \frac{49}{81}, x = - - \frac{49}{81}

- \frac{49}{81} = \frac{7}{9} i

- - \frac{49}{81} = - \frac{7}{9} i

x = \frac{7}{9} i, x = - \frac{7}{9} i