a/(x^2)+bx^2=-21

解

\frac{a}{x ^{2}} + b x^{2} = - 21

x = \frac{- 21 + 441 - 4 ab}{2 b}, x = - \frac{- 21 + 441 - 4 ab}{2 b}, x = \frac{- 21 - 441 - 4 ab}{2 b}, x = - \frac{- 21 - 441 - 4 ab}{2 b}

解答ステップ

\frac{a}{x ^{2}} + b x^{2} = - 21

以下で両辺を乗じる:

x^{2}

a + b x^{4} = - 21 x^{2}

解く

a + b x^{4} = - 21 x^{2} : x = \frac{- 21 + 441 - 4 ab}{2 b}, x = - \frac{- 21 + 441 - 4 ab}{2 b}, x = \frac{- 21 - 441 - 4 ab}{2 b}, x = - \frac{- 21 - 441 - 4 ab}{2 b}

x = \frac{- 21 + 441 - 4 ab}{2 b}, x = - \frac{- 21 + 441 - 4 ab}{2 b}, x = \frac{- 21 - 441 - 4 ab}{2 b}, x = - \frac{- 21 - 441 - 4 ab}{2 b}