1/4 (1200-3x^2)=0

解

\frac{1}{4} (1200 - 3 x^{2}) = 0

x = 20, x = - 20

解答ステップ

\frac{1}{4} (1200 - 3 x^{2}) = 0

以下で両辺を乗じる:

4

1200 - 3 x^{2} = 0

1200

を右側に移動します

- 3 x^{2} = - 1200

以下で両辺を割る

- 3

x^{2} = 400

x^{2} = f (a)

の場合, 解は

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

x = 400, x = - 400

400 = 20

- 400 = - 20

x = 20, x = - 20