400x^2+90000=360000

解

400 x^{2} + 90000 = 360000

x = 153, x = - 153

十進法表記

x = 25.98076 \dots, x = - 25.98076 \dots

解答ステップ

400 x^{2} + 90000 = 360000

90000

を右側に移動します

400 x^{2} = 270000

以下で両辺を割る

400

x^{2} = 675

x^{2} = f (a)

の場合, 解は

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

x = 675, x = - 675

675 = 153

- 675 = - 153

x = 153, x = - 153