9x^2=121

解

9 x^{2} = 121

x = \frac{11}{3}, x = - \frac{11}{3}

十進法表記

x = 3.66666 \dots, x = - 3.66666 \dots

解答ステップ

9 x^{2} = 121

以下で両辺を割る

9

x^{2} = \frac{121}{9}

x^{2} = f (a)

の場合, 解は

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

x = \frac{121}{9}, x = - \frac{121}{9}

\frac{121}{9} = \frac{11}{3}

- \frac{121}{9} = - \frac{11}{3}

x = \frac{11}{3}, x = - \frac{11}{3}